{"id":38004,"date":"2025-08-01T10:56:00","date_gmt":"2025-08-01T03:56:00","guid":{"rendered":"https:\/\/www.ckconitsha.com\/vn\/?p=38004"},"modified":"2025-08-01T20:36:08","modified_gmt":"2025-08-01T13:36:08","slug":"cong-thuc-tinh-dien-tich-hinh-tam-giac-va-bai-tap-co-dap-an","status":"publish","type":"post","link":"https:\/\/www.ckconitsha.com\/vn\/cong-thuc-tinh-dien-tich-hinh-tam-giac-va-bai-tap-co-dap-an\/","title":{"rendered":"C\u00f4ng th\u1ee9c t\u00ednh di\u1ec7n t\u00edch h\u00ecnh tam gi\u00e1c v\u00e0 b\u00e0i t\u1eadp [c\u00f3 \u0111\u00e1p \u00e1n]"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_79_2 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.ckconitsha.com\/vn\/cong-thuc-tinh-dien-tich-hinh-tam-giac-va-bai-tap-co-dap-an\/#Kien_thuc_can_nho_de_hoc_tot_cach_tinh_dien_tich_hinh_tam_giac\" >Ki\u1ebfn th\u1ee9c c\u1ea7n nh\u1edb \u0111\u1ec3 h\u1ecdc t\u1ed1t c\u00e1ch t\u00ednh di\u1ec7n t\u00edch h\u00ecnh tam gi\u00e1c<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.ckconitsha.com\/vn\/cong-thuc-tinh-dien-tich-hinh-tam-giac-va-bai-tap-co-dap-an\/#Khai_niem_hinh_tam_giac\" >Kh\u00e1i ni\u1ec7m h\u00ecnh tam gi\u00e1c<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.ckconitsha.com\/vn\/cong-thuc-tinh-dien-tich-hinh-tam-giac-va-bai-tap-co-dap-an\/#Cac_tinh_chat_co_ban_cua_hinh_tam_giac\" >C\u00e1c t\u00ednh ch\u1ea5t c\u01a1 b\u1ea3n c\u1ee7a h\u00ecnh tam gi\u00e1c<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.ckconitsha.com\/vn\/cong-thuc-tinh-dien-tich-hinh-tam-giac-va-bai-tap-co-dap-an\/#Ky_hieu_hinh_tam_giac_trong_toan_hoc\" >K\u00fd hi\u1ec7u h\u00ecnh tam gi\u00e1c trong to\u00e1n h\u1ecdc<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.ckconitsha.com\/vn\/cong-thuc-tinh-dien-tich-hinh-tam-giac-va-bai-tap-co-dap-an\/#Cac_loai_tam_giac_thuong_gap\" >C\u00e1c lo\u1ea1i tam gi\u00e1c th\u01b0\u1eddng g\u1eb7p<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.ckconitsha.com\/vn\/cong-thuc-tinh-dien-tich-hinh-tam-giac-va-bai-tap-co-dap-an\/#Tam_giac_deu\" >Tam gi\u00e1c \u0111\u1ec1u<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/www.ckconitsha.com\/vn\/cong-thuc-tinh-dien-tich-hinh-tam-giac-va-bai-tap-co-dap-an\/#Tam_giac_vuong\" >Tam gi\u00e1c vu\u00f4ng<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/www.ckconitsha.com\/vn\/cong-thuc-tinh-dien-tich-hinh-tam-giac-va-bai-tap-co-dap-an\/#Tam_giac_can\" >Tam gi\u00e1c c\u00e2n<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/www.ckconitsha.com\/vn\/cong-thuc-tinh-dien-tich-hinh-tam-giac-va-bai-tap-co-dap-an\/#Tam_giac_vuong_can\" >Tam gi\u00e1c vu\u00f4ng c\u00e2n<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/www.ckconitsha.com\/vn\/cong-thuc-tinh-dien-tich-hinh-tam-giac-va-bai-tap-co-dap-an\/#Tam_giac_nhon\" >Tam gi\u00e1c nh\u1ecdn<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/www.ckconitsha.com\/vn\/cong-thuc-tinh-dien-tich-hinh-tam-giac-va-bai-tap-co-dap-an\/#Tam_giac_tu\" >Tam gi\u00e1c t\u00f9<\/a><\/li><\/ul><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/www.ckconitsha.com\/vn\/cong-thuc-tinh-dien-tich-hinh-tam-giac-va-bai-tap-co-dap-an\/#Cong_thuc_tinh_dien_tich_hinh_tam_giac_la_gi\" >C\u00f4ng th\u1ee9c t\u00ednh di\u1ec7n t\u00edch h\u00ecnh tam gi\u00e1c l\u00e0 g\u00ec?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/www.ckconitsha.com\/vn\/cong-thuc-tinh-dien-tich-hinh-tam-giac-va-bai-tap-co-dap-an\/#Co_bao_nhieu_loai_tam_giac\" >C\u00f3 bao nhi\u00eau lo\u1ea1i tam gi\u00e1c?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/www.ckconitsha.com\/vn\/cong-thuc-tinh-dien-tich-hinh-tam-giac-va-bai-tap-co-dap-an\/#Cach_tinh_dien_tich_tam_giac_can\" >C\u00e1ch t\u00ednh di\u1ec7n t\u00edch tam gi\u00e1c c\u00e2n<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"https:\/\/www.ckconitsha.com\/vn\/cong-thuc-tinh-dien-tich-hinh-tam-giac-va-bai-tap-co-dap-an\/#Cong_thuc_tinh_dien_tich_tam_giac_deu\" >C\u00f4ng th\u1ee9c t\u00ednh di\u1ec7n t\u00edch tam gi\u00e1c \u0111\u1ec1u<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-16\" href=\"https:\/\/www.ckconitsha.com\/vn\/cong-thuc-tinh-dien-tich-hinh-tam-giac-va-bai-tap-co-dap-an\/#Cach_tinh_dien_tich_tam_giac_vuong\" >C\u00e1ch t\u00ednh di\u1ec7n t\u00edch tam gi\u00e1c vu\u00f4ng<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-17\" href=\"https:\/\/www.ckconitsha.com\/vn\/cong-thuc-tinh-dien-tich-hinh-tam-giac-va-bai-tap-co-dap-an\/#Cong_thuc_tinh_dien_tich_tam_giac_vuong_can\" >C\u00f4ng th\u1ee9c t\u00ednh di\u1ec7n t\u00edch tam gi\u00e1c vu\u00f4ng c\u00e2n<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-18\" href=\"https:\/\/www.ckconitsha.com\/vn\/cong-thuc-tinh-dien-tich-hinh-tam-giac-va-bai-tap-co-dap-an\/#Cong_thuc_tinh_dien_tich_tam_giac_trong_he_toa_do_Oxyz\" >C\u00f4ng th\u1ee9c t\u00ednh di\u1ec7n t\u00edch tam gi\u00e1c trong h\u1ec7 t\u1ecda \u0111\u1ed9 Oxyz<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-19\" href=\"https:\/\/www.ckconitsha.com\/vn\/cong-thuc-tinh-dien-tich-hinh-tam-giac-va-bai-tap-co-dap-an\/#Cac_dang_bai_tap_cach_tinh_dien_tich_tam_giac_co_ban_nang_cao\" >C\u00e1c d\u1ea1ng b\u00e0i t\u1eadp c\u00e1ch t\u00ednh di\u1ec7n t\u00edch tam gi\u00e1c c\u01a1 b\u1ea3n &amp; n\u00e2ng cao<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-20\" href=\"https:\/\/www.ckconitsha.com\/vn\/cong-thuc-tinh-dien-tich-hinh-tam-giac-va-bai-tap-co-dap-an\/#Dang_1_Cach_tinh_dien_tich_tam_giac_khi_biet_do_dai_day_va_chieu_cao\" >D\u1ea1ng 1: C\u00e1ch t\u00ednh di\u1ec7n t\u00edch tam gi\u00e1c khi bi\u1ebft \u0111\u1ed9 d\u00e0i \u0111\u00e1y v\u00e0 chi\u1ec1u cao<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-21\" href=\"https:\/\/www.ckconitsha.com\/vn\/cong-thuc-tinh-dien-tich-hinh-tam-giac-va-bai-tap-co-dap-an\/#Dang_2_Tinh_do_dai_day_khi_biet_dien_tich_hinh_tam_giac_va_chieu_cao\" >D\u1ea1ng 2: T\u00ednh \u0111\u1ed9 d\u00e0i \u0111\u00e1y khi bi\u1ebft di\u1ec7n t\u00edch h\u00ecnh tam gi\u00e1c v\u00e0 chi\u1ec1u cao<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-22\" href=\"https:\/\/www.ckconitsha.com\/vn\/cong-thuc-tinh-dien-tich-hinh-tam-giac-va-bai-tap-co-dap-an\/#Dang_3_Tinh_chieu_cao_khi_biet_dien_tich_tam_giac_va_do_dai_day\" >D\u1ea1ng 3: T\u00ednh chi\u1ec1u cao khi bi\u1ebft di\u1ec7n t\u00edch tam gi\u00e1c v\u00e0 \u0111\u1ed9 d\u00e0i \u0111\u00e1y<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-23\" href=\"https:\/\/www.ckconitsha.com\/vn\/cong-thuc-tinh-dien-tich-hinh-tam-giac-va-bai-tap-co-dap-an\/#Bai_tap_toan_tinh_dien_tich_hinh_tam_giac_de_be_luyen_tap\" >B\u00e0i t\u1eadp to\u00e1n t\u00ednh di\u1ec7n t\u00edch h\u00ecnh tam gi\u00e1c \u0111\u1ec3 b\u00e9 luy\u1ec7n t\u1eadp<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-24\" href=\"https:\/\/www.ckconitsha.com\/vn\/cong-thuc-tinh-dien-tich-hinh-tam-giac-va-bai-tap-co-dap-an\/#Bi_quyet_giup_be_ghi_nho_cong_thuc_tam_giac_tinh_dien_tich_hieu_qua\" >B\u00ed quy\u1ebft gi\u00fap b\u00e9 ghi nh\u1edb c\u00f4ng th\u1ee9c tam gi\u00e1c t\u00ednh di\u1ec7n t\u00edch hi\u1ec7u qu\u1ea3<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-25\" href=\"https:\/\/www.ckconitsha.com\/vn\/cong-thuc-tinh-dien-tich-hinh-tam-giac-va-bai-tap-co-dap-an\/#Nam_chac_cac_kien_thuc_co_ban_va_cong_thuc_hinh_tam_giac_khi_tinh_dien_tich\" >N\u1eafm ch\u1eafc c\u00e1c ki\u1ebfn th\u1ee9c c\u01a1 b\u1ea3n v\u00e0 c\u00f4ng th\u1ee9c h\u00ecnh tam gi\u00e1c khi t\u00ednh di\u1ec7n t\u00edch<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-26\" href=\"https:\/\/www.ckconitsha.com\/vn\/cong-thuc-tinh-dien-tich-hinh-tam-giac-va-bai-tap-co-dap-an\/#Xay_dung_nen_tang_toan_hoc_vung_chac_cho_be_cung_Shining_Home_%E2%80%93_Gia_dinh_Anh_Ngu_Math\" >X\u00e2y d\u1ef1ng n\u1ec1n t\u1ea3ng to\u00e1n h\u1ecdc v\u1eefng ch\u1eafc cho b\u00e9 c\u00f9ng Shining Home &#8211; Gia \u0111\u00ecnh Anh Ng\u1eef Math<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-27\" href=\"https:\/\/www.ckconitsha.com\/vn\/cong-thuc-tinh-dien-tich-hinh-tam-giac-va-bai-tap-co-dap-an\/#Cung_be_thuc_hanh_thuong_xuyen\" >C\u00f9ng b\u00e9 th\u1ef1c h\u00e0nh th\u01b0\u1eddng xuy\u00ean<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-28\" href=\"https:\/\/www.ckconitsha.com\/vn\/cong-thuc-tinh-dien-tich-hinh-tam-giac-va-bai-tap-co-dap-an\/#Ung_dung_cua_cong_thuc_dien_tich_hinh_tam_giac_trong_thuc_tien\" >\u1ee8ng d\u1ee5ng c\u1ee7a c\u00f4ng th\u1ee9c di\u1ec7n t\u00edch h\u00ecnh tam gi\u00e1c trong th\u1ef1c ti\u1ec5n<\/a><\/li><\/ul><\/nav><\/div>\n<\/p>\n<p>Di\u1ec7n t\u00edch h\u00ecnh tam gi\u00e1c l\u00e0 d\u1ea1ng to\u00e1n c\u1ea5p 1 c\u00e1c em s\u1ebd \u0111\u01b0\u1ee3c h\u1ecdc. Nh\u01b0ng v\u00ec trong h\u00ecnh tam gi\u00e1c c\u00f3 nhi\u1ec1u th\u1ec3 lo\u1ea1i kh\u00e1c nhau, n\u00ean l\u01b0\u1ee3ng c\u00f4ng th\u1ee9c c\u0169ng s\u1ebd nhi\u1ec1u h\u01a1n. V\u1eady n\u00ean, \u0111\u1ec3 gi\u00fap c\u00e1c em h\u1ecdc v\u00e0 ghi nh\u1edb ki\u1ebfn th\u1ee9c n\u00e0y hi\u1ec7u qu\u1ea3, h\u00e3y c\u00f9ng Shining Home &#8211; Gia \u0111\u00ecnh Anh Ng\u1eef tham kh\u1ea3o ngay b\u00e0i vi\u1ebft sau \u0111\u00e2y nh\u00e9.<\/p>\n<p>                                    <img decoding=\"async\" src=\"https:\/\/external-content.duckduckgo.com\/iu\/?u=https:\/\/vnmedia2.monkeyuni.net\/upload\/web\/image\/600x480_(1).png\"><\/p>\n<h2 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Kien_thuc_can_nho_de_hoc_tot_cach_tinh_dien_tich_hinh_tam_giac\"><\/span>Ki\u1ebfn th\u1ee9c c\u1ea7n nh\u1edb \u0111\u1ec3 h\u1ecdc t\u1ed1t c\u00e1ch t\u00ednh di\u1ec7n t\u00edch h\u00ecnh tam gi\u00e1c<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p style=\"font-size: medium;font-weight: 400\">\u0110\u1ec3 l\u00e0m t\u1ed1t b\u00e0i t\u1eadp v\u1ec1 c\u00e1ch t\u00ednh di\u1ec7n t\u00edch h\u00ecnh tam gi\u00e1c, b\u1ea1n c\u1ea7n ghi nh\u1edb m\u1ed9t s\u1ed1 n\u1ed9i dung quan tr\u1ecdng d\u01b0\u1edbi \u0111\u00e2y.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Khai_niem_hinh_tam_giac\"><\/span>Kh\u00e1i ni\u1ec7m h\u00ecnh tam gi\u00e1c<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p style=\"font-size: medium;font-weight: 400\">H\u00ecnh tam gi\u00e1c l\u00e0 m\u1ed9t trong c\u00e1c h\u00ecnh c\u01a1 b\u1ea3n trong h\u00ecnh h\u1ecdc, c\u00f3 ba \u0111\u1ec9nh l\u00e0 ba \u0111i\u1ec3m kh\u00f4ng th\u1eb3ng h\u00e0ng v\u00e0 ba c\u1ea1nh l\u00e0 ba \u0111o\u1ea1n th\u1eb3ng n\u1ed1i c\u00e1c \u0111\u1ec9nh v\u1edbi nhau. \u0110\u1eb7c tr\u01b0ng quan tr\u1ecdng c\u1ee7a tam gi\u00e1c l\u00e0 t\u1ed5ng ba g\u00f3c trong m\u1ed9t tam gi\u00e1c ph\u1ea3i lu\u00f4n b\u1eb1ng 180 \u0111\u1ed9.<\/p>\n<p style=\"font-size: medium;font-weight: 400\"><img decoding=\"async\" class=\"lazyload\" src=\"https:\/\/external-content.duckduckgo.com\/iu\/?u=https:\/\/vnmedia2.monkeyuni.net\/upload\/web\/img\/dien-tich-hinh-tam-giac-11.jpg\" alt=\"Kh\u00e1i ni\u1ec7m h\u00ecnh tam gi\u00e1c. (\u1ea2nh: S\u01b0u t\u1ea7m Internet)\" width=\"100%\"><\/p>\n<h3><span class=\"ez-toc-section\" id=\"Cac_tinh_chat_co_ban_cua_hinh_tam_giac\"><\/span>C\u00e1c t\u00ednh ch\u1ea5t c\u01a1 b\u1ea3n c\u1ee7a h\u00ecnh tam gi\u00e1c<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p style=\"font-size: medium;font-weight: 400\">1. T\u00ednh ch\u1ea5t v\u1ec1 g\u00f3c c\u1ee7a h\u00ecnh tam gi\u00e1c:<\/p>\n<p style=\"font-size: medium;font-weight: 400\">T\u1ed5ng ba g\u00f3c trong m\u1ed9t tam gi\u00e1c lu\u00f4n b\u1eb1ng 180 \u0111\u1ed9. V\u00ed d\u1ee5: Ta k\u00fd hi\u1ec7u c\u00e1c g\u00f3c trong tam gi\u00e1c l\u00e0 A, B v\u00e0 C, th\u00ec A + B + C = 180 \u0111\u1ed9.<\/p>\n<p style=\"font-size: medium;font-weight: 400\">2. T\u00ednh ch\u1ea5t v\u1ec1 c\u1ea1nh c\u1ee7a h\u00ecnh tam gi\u00e1c:<\/p>\n<p style=\"font-size: medium;font-weight: 400\">Hay c\u00f2n \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 b\u1ea5t \u0111\u1eb3ng th\u1ee9c tam gi\u00e1c. T\u1ed5ng \u0111\u1ed9 d\u00e0i hai c\u1ea1nh c\u1ee7a tam gi\u00e1c lu\u00f4n l\u1edbn h\u01a1n \u0111\u1ed9 d\u00e0i c\u1ea1nh c\u00f2n l\u1ea1i. \u0110i\u1ec1u n\u00e0y c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c bi\u1ec3u di\u1ec5n nh\u01b0 sau: a + b &gt; c, b + c &gt; a, c + a &gt; b. (Trong \u0111\u00f3: a, b, c l\u1ea7n l\u01b0\u1ee3t l\u00e0 c\u00e1c c\u1ea1nh c\u1ee7a m\u1ed9t h\u00ecnh tam gi\u00e1c.)<\/p>\n<p style=\"font-size: medium;font-weight: 400\">3. Hai tam gi\u00e1c b\u1eb1ng nhau:<\/p>\n<p style=\"font-size: medium;font-weight: 400\">Hai tam gi\u00e1c \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 b\u1eb1ng nhau (hay \u0111\u1ed3ng d\u1ea1ng) khi c\u00e1c c\u1ea1nh v\u00e0 c\u00e1c g\u00f3c c\u1ee7a ch\u00fang t\u01b0\u01a1ng \u1ee9ng b\u1eb1ng nhau. \u0110i\u1ec1u n\u00e0y c\u00f3 ngh\u0129a l\u00e0 c\u00e1c c\u1eb7p c\u1ea1nh t\u01b0\u01a1ng \u1ee9ng c\u1ee7a hai tam gi\u00e1c c\u00f3 \u0111\u1ed9 d\u00e0i b\u1eb1ng nhau v\u00e0 c\u00e1c c\u1eb7p g\u00f3c t\u01b0\u01a1ng \u1ee9ng c\u0169ng c\u00f3 gi\u00e1 tr\u1ecb b\u1eb1ng nhau.<\/p>\n<p style=\"font-size: medium;font-weight: 400\"><img decoding=\"async\" class=\"lazyload\" src=\"https:\/\/external-content.duckduckgo.com\/iu\/?u=https:\/\/vnmedia2.monkeyuni.net\/upload\/web\/img\/dien-tich-hinh-tam-giac-12.png\" alt=\"Hai tam gi\u00e1c b\u1eb1ng nhau. (\u1ea2nh: S\u01b0u t\u1ea7m Internet)\" width=\"100%\"><\/p>\n<p style=\"font-size: medium;font-weight: 400\">4. \u0110\u01b0\u1eddng cao c\u1ee7a h\u00ecnh tam gi\u00e1c:<\/p>\n<p style=\"font-size: medium;font-weight: 400\">H\u00ecnh tam gi\u00e1c c\u00f3 ba \u0111\u01b0\u1eddng cao, l\u00e0 c\u00e1c \u0111\u01b0\u1eddng vu\u00f4ng g\u00f3c v\u1edbi c\u00e1c c\u1ea1nh v\u00e0 \u0111i qua c\u00e1c \u0111\u1ec9nh t\u01b0\u01a1ng \u1ee9ng.<\/p>\n<p style=\"font-size: medium;font-weight: 400\">5. \u0110\u01b0\u1eddng trung tuy\u1ebfn c\u1ee7a h\u00ecnh tam gi\u00e1c:<\/p>\n<p style=\"font-size: medium;font-weight: 400\">H\u00ecnh tam gi\u00e1c c\u00f3 ba \u0111\u01b0\u1eddng trung tuy\u1ebfn, l\u00e0 c\u00e1c \u0111\u01b0\u1eddng n\u1ed1i c\u00e1c \u0111\u1ec9nh v\u1edbi trung \u0111i\u1ec3m c\u1ee7a c\u00e1c c\u1ea1nh t\u01b0\u01a1ng \u1ee9ng.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Ky_hieu_hinh_tam_giac_trong_toan_hoc\"><\/span>K\u00fd hi\u1ec7u h\u00ecnh tam gi\u00e1c trong to\u00e1n h\u1ecdc<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p style=\"font-size: medium;font-weight: 400\">Trong to\u00e1n h\u1ecdc, h\u00ecnh tam gi\u00e1c th\u01b0\u1eddng \u0111\u01b0\u1ee3c k\u00fd hi\u1ec7u b\u1eb1ng c\u00e1c ch\u1eef c\u00e1i vi\u1ebft th\u01b0\u1eddng ho\u1eb7c ch\u1eef c\u00e1i hoa g\u1ea1ch d\u01b0\u1edbi. C\u00f3 m\u1ed9t s\u1ed1 k\u00fd hi\u1ec7u ph\u1ed5 bi\u1ebfn \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 bi\u1ec3u th\u1ecb tam gi\u00e1c, nh\u01b0:<\/p>\n<ul style=\"font-size: medium;font-weight: 400\">\n<li>S\u1eed d\u1ee5ng c\u00e1c ch\u1eef c\u00e1i vi\u1ebft th\u01b0\u1eddng:\u00a0Tam gi\u00e1c ABC, trong \u0111\u00f3 A, B, C l\u00e0 ba \u0111\u1ec9nh c\u1ee7a tam gi\u00e1c.<\/li>\n<li>S\u1eed d\u1ee5ng c\u00e1c ch\u1eef c\u00e1i vi\u1ebft hoa g\u1ea1ch d\u01b0\u1edbi:\u00a0Tam gi\u00e1c \u0394ABC, trong \u0111\u00f3 \u0394 \u0111\u1ea1i di\u1ec7n cho h\u00ecnh tam gi\u00e1c v\u00e0 A, B, C l\u00e0 ba \u0111\u1ec9nh c\u1ee7a tam gi\u00e1c.<\/li>\n<li>S\u1eed d\u1ee5ng ch\u1ec9 s\u1ed1:\u00a0Tam gi\u00e1c ABC, trong \u0111\u00f3 A, B, C c\u00f3 ch\u1ec9 s\u1ed1 d\u01b0\u1edbi \u0111\u1ec3 ch\u1ec9 \u0111\u1ec9nh t\u01b0\u01a1ng \u1ee9ng. V\u00ed d\u1ee5: A1B2C3.<\/li>\n<\/ul>\n<h3><span class=\"ez-toc-section\" id=\"Cac_loai_tam_giac_thuong_gap\"><\/span>C\u00e1c lo\u1ea1i tam gi\u00e1c th\u01b0\u1eddng g\u1eb7p<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p style=\"font-size: medium;font-weight: 400\">H\u00ecnh tam gi\u00e1c \u0111\u01b0\u1ee3c ph\u00e2n th\u00e0nh nhi\u1ec1u lo\u1ea1i d\u1ef1a tr\u00ean \u0111\u1eb7c \u0111i\u1ec3m c\u1ee7a c\u00e1c c\u1ea1nh v\u00e0 c\u00e1c g\u00f3c. C\u1ee5 th\u1ec3 nh\u01b0 sau:<\/p>\n<h4><span class=\"ez-toc-section\" id=\"Tam_giac_deu\"><\/span>Tam gi\u00e1c \u0111\u1ec1u<span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p style=\"font-size: medium;font-weight: 400\">Tam gi\u00e1c \u0111\u1ec1u l\u00e0 tam gi\u00e1c c\u00f3 c\u1ea3 ba c\u1ea1nh v\u00e0 ba g\u00f3c b\u1eb1ng nhau. T\u1ea5t c\u1ea3 c\u00e1c g\u00f3c trong tam gi\u00e1c \u0111\u1ec1u \u0111\u1ec1u c\u00f3 gi\u00e1 tr\u1ecb 60 \u0111\u1ed9.<\/p>\n<p style=\"font-size: medium;font-weight: 400\"><img loading=\"lazy\" decoding=\"async\" style=\"margin-left: auto;margin-right: auto\" class=\"lazyload\" src=\"https:\/\/external-content.duckduckgo.com\/iu\/?u=https:\/\/vnmedia2.monkeyuni.net\/upload\/web\/img\/dien-tich-hinh-tam-giac-13.png\" alt=\"Tam gi\u00e1c \u0111\u1ec1u. (\u1ea2nh: S\u01b0u t\u1ea7m Internet)\" width=\"200\" height=\"162\"><\/p>\n<h4><span class=\"ez-toc-section\" id=\"Tam_giac_vuong\"><\/span>Tam gi\u00e1c vu\u00f4ng<span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p style=\"font-size: medium;font-weight: 400\">Tam gi\u00e1c vu\u00f4ng c\u00f3 m\u1ed9t g\u00f3c vu\u00f4ng, t\u1ee9c l\u00e0 m\u1ed9t g\u00f3c c\u00f3 gi\u00e1 tr\u1ecb ch\u00ednh x\u00e1c l\u00e0 90 \u0111\u1ed9.<\/p>\n<p style=\"font-size: medium;font-weight: 400\"><img loading=\"lazy\" decoding=\"async\" style=\"margin-left: auto;margin-right: auto\" class=\"lazyload\" src=\"https:\/\/external-content.duckduckgo.com\/iu\/?u=https:\/\/vnmedia2.monkeyuni.net\/upload\/web\/img\/dien-tich-hinh-tam-giac-14.png\" alt=\"Tam gi\u00e1c vu\u00f4ng. (\u1ea2nh: S\u01b0u t\u1ea7m Internet)\" width=\"200\" height=\"170\"><\/p>\n<h4><span class=\"ez-toc-section\" id=\"Tam_giac_can\"><\/span>Tam gi\u00e1c c\u00e2n<span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p style=\"font-size: medium;font-weight: 400\">Tam gi\u00e1c c\u00e2n l\u00e0 tam gi\u00e1c c\u00f3 \u00edt nh\u1ea5t hai c\u1ea1nh b\u1eb1ng nhau. \u0110i\u1ec1u n\u00e0y \u0111\u1ed3ng ngh\u0129a v\u1edbi vi\u1ec7c c\u00f3 \u00edt nh\u1ea5t hai g\u00f3c b\u1eb1ng nhau.<\/p>\n<p style=\"font-size: medium;font-weight: 400\"><img decoding=\"async\" class=\"lazyload\" src=\"https:\/\/external-content.duckduckgo.com\/iu\/?u=https:\/\/vnmedia2.monkeyuni.net\/upload\/web\/img\/dien-tich-hinh-tam-giac-15.png\" alt=\"Tam gi\u00e1c c\u00e2n. (\u1ea2nh: S\u01b0u t\u1ea7m Internet)\" width=\"100%\"><\/p>\n<p style=\"font-size: medium;font-weight: 400\">\n<h4><span class=\"ez-toc-section\" id=\"Tam_giac_vuong_can\"><\/span>Tam gi\u00e1c vu\u00f4ng c\u00e2n<span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p style=\"font-size: medium;font-weight: 400\">Tam gi\u00e1c vu\u00f4ng c\u00e2n l\u00e0 tam gi\u00e1c c\u00f3 m\u1ed9t g\u00f3c vu\u00f4ng v\u00e0 hai c\u1ea1nh g\u1ea7n vu\u00f4ng b\u1eb1ng nhau.<\/p>\n<p style=\"font-size: medium;font-weight: 400\"><img loading=\"lazy\" decoding=\"async\" style=\"margin-left: auto;margin-right: auto\" class=\"lazyload\" src=\"https:\/\/external-content.duckduckgo.com\/iu\/?u=https:\/\/vnmedia2.monkeyuni.net\/upload\/web\/img\/dien-tich-hinh-tam-giac-16.png\" alt=\"Tam gi\u00e1c vu\u00f4ng c\u00e2n. (\u1ea2nh: S\u01b0u t\u1ea7m Internet)\" width=\"200\" height=\"205\"><\/p>\n<h4><span class=\"ez-toc-section\" id=\"Tam_giac_nhon\"><\/span>Tam gi\u00e1c nh\u1ecdn<span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p style=\"font-size: medium;font-weight: 400\">Tam gi\u00e1c nh\u1ecdn l\u00e0 tam gi\u00e1c c\u00f3 t\u1ea5t c\u1ea3 ba g\u00f3c \u0111\u1ec1u nh\u1ecdn, t\u1ee9c l\u00e0 c\u00f3 gi\u00e1 tr\u1ecb nh\u1ecf h\u01a1n 90 \u0111\u1ed9.<\/p>\n<p style=\"font-size: medium;font-weight: 400\"><img decoding=\"async\" class=\"lazyload\" src=\"https:\/\/external-content.duckduckgo.com\/iu\/?u=https:\/\/vnmedia2.monkeyuni.net\/upload\/web\/img\/dien-tich-hinh-tam-giac-17.png\" alt=\"Tam gi\u00e1c nh\u1ecdn. (\u1ea2nh: S\u01b0u t\u1ea7m Internet)\" width=\"100%\"><\/p>\n<h4><span class=\"ez-toc-section\" id=\"Tam_giac_tu\"><\/span>Tam gi\u00e1c t\u00f9<span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p style=\"font-size: medium;font-weight: 400\">Tam gi\u00e1c t\u00f9 l\u00e0 tam gi\u00e1c c\u00f3 m\u1ed9t g\u00f3c t\u00f9, t\u1ee9c l\u00e0 m\u1ed9t g\u00f3c c\u00f3 gi\u00e1 tr\u1ecb l\u1edbn h\u01a1n 90 \u0111\u1ed9.<\/p>\n<p style=\"font-size: medium;font-weight: 400\"><img decoding=\"async\" style=\"margin-left: auto;margin-right: auto\" class=\"lazyload\" src=\"https:\/\/external-content.duckduckgo.com\/iu\/?u=https:\/\/vnmedia2.monkeyuni.net\/upload\/web\/img\/dien-tich-hinh-tam-giac-18.png\" alt=\"Tam gi\u00e1c t\u00f9. (\u1ea2nh: S\u01b0u t\u1ea7m Internet)\" width=\"100%\"><\/p>\n<h2 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Cong_thuc_tinh_dien_tich_hinh_tam_giac_la_gi\"><\/span>C\u00f4ng th\u1ee9c t\u00ednh di\u1ec7n t\u00edch h\u00ecnh tam gi\u00e1c l\u00e0 g\u00ec?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p dir=\"ltr\">C\u00f4ng th\u1ee9c t\u00ednh di\u1ec7n t\u00edch c\u1ee7a tam gi\u00e1c l\u00e0 S = (a x h) \/ 2. Trong \u0111\u00f3, a l\u00e0 \u0111\u1ed9 d\u00e0i \u0111\u00e1y c\u1ee7a tam gi\u00e1c v\u00e0 h l\u00e0 chi\u1ec1u cao t\u1eeb \u0111\u1ec9nh vu\u00f4ng g\u00f3c t\u1edbi \u0111\u00e1y c\u1ee7a tam gi\u00e1c. \u0110\u1ec3 t\u00ednh di\u1ec7n t\u00edch tam gi\u00e1c, ta nh\u00e2n \u0111\u1ed9 d\u00e0i \u0111\u00e1y v\u1edbi chi\u1ec1u cao, sau \u0111\u00f3 chia k\u1ebft qu\u1ea3 cho 2.<\/p>\n<p dir=\"ltr\">V\u00ed d\u1ee5 c\u00e1ch t\u00ednh S tam gi\u00e1c:<\/p>\n<p dir=\"ltr\"><em>T\u00ednh di\u1ec7n t\u00edch tam gi\u00e1c c\u00f3 \u0111\u1ed9 d\u00e0i \u0111\u00e1y l\u00e0 5m v\u00e0 chi\u1ec1u cao l\u00e0 24dm.<\/em><\/p>\n<p dir=\"ltr\"><em>Gi\u1ea3i:\u00a0<\/em><\/p>\n<p dir=\"ltr\"><em>Chi\u1ec1u cao 24dm = 2,4m<\/em><\/p>\n<p dir=\"ltr\"><em>\u00c1p d\u1ee5ng c\u00f4ng th\u1ee9c t\u00ednh di\u1ec7n t\u00edch tam gi\u00e1c ta c\u00f3:<\/em><\/p>\n<p dir=\"ltr\"><em>S tam gi\u00e1c =(5 x 2.4)\/2 = 6m2<\/em><\/p>\n<p dir=\"ltr\"><img loading=\"lazy\" decoding=\"async\" class=\"lazyload\" src=\"https:\/\/external-content.duckduckgo.com\/iu\/?u=https:\/\/vnmedia2.monkeyuni.net\/upload\/web\/img\/dien-tich-hinh-tam-giac-01.jpg\" alt=\"C\u00f4ng th\u1ee9c t\u00ednh di\u1ec7n t\u00edch tam gi\u00e1c chung. (\u1ea2nh: Internet)\" width=\"800\" height=\"502\"><\/p>\n<h2 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Co_bao_nhieu_loai_tam_giac\"><\/span>C\u00f3 bao nhi\u00eau lo\u1ea1i tam gi\u00e1c?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p dir=\"ltr\">Tam gi\u00e1c c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c ph\u00e2n lo\u1ea1i theo nhi\u1ec1u c\u00e1ch kh\u00e1c nhau, d\u1ef1a tr\u00ean c\u00e1c \u0111\u1eb7c \u0111i\u1ec3m c\u1ee7a c\u00e1c c\u1ea1nh v\u00e0 g\u00f3c. D\u01b0\u1edbi \u0111\u00e2y l\u00e0 7 lo\u1ea1i tam gi\u00e1c ph\u1ed5 bi\u1ebfn:<\/p>\n<ol>\n<li dir=\"ltr\">Tam gi\u00e1c vu\u00f4ng l\u00e0 tam gi\u00e1c c\u00f3 m\u1ed9t g\u00f3c b\u1eb1ng 90 \u0111\u1ed9. Hai c\u1ea1nh t\u1ea1o n\u00ean g\u00f3c vu\u00f4ng \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 c\u1ea1nh g\u00f3c vu\u00f4ng, c\u00f2n c\u1ea1nh c\u00f2n l\u1ea1i \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 c\u1ea1nh huy\u1ec1n.<\/li>\n<li dir=\"ltr\">Tam gi\u00e1c c\u00e2n l\u00e0 tam gi\u00e1c c\u00f3 hai c\u1ea1nh b\u1eb1ng nhau. Hai c\u1ea1nh b\u1eb1ng nhau n\u00e0y \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 c\u1ea1nh b\u00ean, c\u00f2n c\u1ea1nh c\u00f2n l\u1ea1i \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 c\u1ea1nh \u0111\u00e1y.<\/li>\n<li dir=\"ltr\">Tam gi\u00e1c \u0111\u1ec1u l\u00e0 tam gi\u00e1c c\u00f3 c\u1ea3 ba c\u1ea1nh b\u1eb1ng nhau.<\/li>\n<li dir=\"ltr\">Tam gi\u00e1c nh\u1ecdn l\u00e0 tam gi\u00e1c c\u00f3 t\u1ea5t c\u1ea3 ba g\u00f3c nh\u1ecf h\u01a1n 90 \u0111\u1ed9.<\/li>\n<li dir=\"ltr\">Tam gi\u00e1c t\u00f9 l\u00e0 tam gi\u00e1c c\u00f3 m\u1ed9t g\u00f3c l\u1edbn h\u01a1n 90 \u0111\u1ed9.<\/li>\n<li dir=\"ltr\">Tam gi\u00e1c th\u01b0\u1eddng l\u00e0 tam gi\u00e1c kh\u00f4ng c\u00f3 c\u1ea1nh v\u00e0 g\u00f3c n\u00e0o b\u1eb1ng nhau.<\/li>\n<li dir=\"ltr\">Tam gi\u00e1c vu\u00f4ng c\u00e2n l\u00e0 tam gi\u00e1c v\u1eeba vu\u00f4ng v\u1eeba c\u00e2n, t\u1ee9c l\u00e0 c\u00f3 c\u1ea3 hai c\u1ea1nh g\u00f3c vu\u00f4ng v\u00e0 hai c\u1ea1nh b\u00ean b\u1eb1ng nhau.<\/li>\n<\/ol>\n<p dir=\"ltr\">D\u01b0\u1edbi \u0111\u00e2y l\u00e0 c\u00e1c c\u00f4ng th\u1ee9c t\u00ednh di\u1ec7n t\u00edch tam gi\u00e1c \u0111\u1ea7y \u0111\u1ee7 v\u00e0 chi ti\u1ebft nh\u1ea5t m\u00e0 b\u1ea1n c\u00f3 th\u1ec3 tham kh\u1ea3o.<\/p>\n<h2 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Cach_tinh_dien_tich_tam_giac_can\"><\/span>C\u00e1ch t\u00ednh di\u1ec7n t\u00edch tam gi\u00e1c c\u00e2n<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p dir=\"ltr\">Di\u1ec7n t\u00edch h\u00ecnh tam gi\u00e1c c\u00e2n S b\u1eb1ng t\u00edch c\u1ee7a chi\u1ec1u cao n\u1ed1i t\u1eeb \u0111\u1ec9nh tam gi\u00e1c \u0111\u00f3 t\u1edbi c\u1ea1nh \u0111\u00e1y tam gi\u00e1c, sau \u0111\u00f3 chia cho 2: S = (a x h)\/ 2.\u00a0Trong \u0111\u00f3: a l\u00e0 chi\u1ec1u d\u00e0i \u0111\u00e1y tam gi\u00e1c c\u00e2n v\u00e0 h l\u00e0 chi\u1ec1u cao c\u1ee7a tam gi\u00e1c.<\/p>\n<p dir=\"ltr\" style=\"text-align: left\">\u00a0<\/p>\n<p dir=\"ltr\"><img decoding=\"async\" class=\"lazyload\" src=\"https:\/\/external-content.duckduckgo.com\/iu\/?u=https:\/\/vnmedia2.monkeyuni.net\/upload\/web\/img\/dien-tich-hinh-tam-giac-2.jpg\" alt=\"H\u00ecnh tam gi\u00e1c c\u00e2n. (\u1ea3nh: S\u01b0u t\u1ea7m internet)\" width=\"100%\"><\/p>\n<p dir=\"ltr\"><em>V\u00ed d\u1ee5: T\u00ednh di\u1ec7n t\u00edch tam gi\u00e1c c\u00e2n c\u00f3:<\/em><\/p>\n<p dir=\"ltr\"><em>a, \u0110\u1ed9 d\u00e0i c\u1ea1nh \u0111\u00e1y b\u1eb1ng 6cm v\u00e0 \u0111\u01b0\u1eddng cao b\u1eb1ng 7cm<\/em><\/p>\n<p dir=\"ltr\"><em>b, \u0110\u1ed9 d\u00e0i c\u1ea1nh \u0111\u00e1y b\u1eb1ng 5m v\u00e0 \u0111\u01b0\u1eddng cao b\u1eb1ng 3,2m<\/em><\/p>\n<p dir=\"ltr\"><em>L\u1eddi gi\u1ea3i:<\/em><\/p>\n<p dir=\"ltr\"><em>a, Di\u1ec7n t\u00edch c\u1ee7a h\u00ecnh tam gi\u00e1c l\u00e0:<\/em><\/p>\n<p dir=\"ltr\"><em>S tam gi\u00e1c = (6 x 7) : 2 = 21 (cm2)<\/em><\/p>\n<p dir=\"ltr\"><em>\u0110\u00e1p s\u1ed1: 21cm2<\/em><\/p>\n<p dir=\"ltr\"><em>b, Di\u1ec7n t\u00edch c\u1ee7a h\u00ecnh tam gi\u00e1c l\u00e0:<\/em><\/p>\n<p dir=\"ltr\"><em>S tam gi\u00e1c = (5 x 3,2) : 2 = 8 (m2)<\/em><\/p>\n<p dir=\"ltr\"><em>\u0110\u00e1p s\u1ed1: 8m2<\/em><\/p>\n<h2 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Cong_thuc_tinh_dien_tich_tam_giac_deu\"><\/span>C\u00f4ng th\u1ee9c t\u00ednh di\u1ec7n t\u00edch tam gi\u00e1c \u0111\u1ec1u<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p dir=\"ltr\">Di\u1ec7n t\u00edch h\u00ecnh tam gi\u00e1c \u0111\u1ec1u (hay s tam gi\u00e1c \u0111\u1ec1u) b\u1eb1ng t\u00edch chi\u1ec1u cao v\u00e0 c\u1ea1nh \u0111\u00e1y, sau \u0111\u00f3 chia cho 2: S = (a x h)\/ 2. Trong \u0111\u00f3: a l\u00e0 hi\u1ec1u d\u00e0i \u0111\u00e1y tam gi\u00e1c \u0111\u1ec1u (\u0111\u00e1y l\u00e0 m\u1ed9t trong 3 c\u1ea1nh c\u1ee7a tam gi\u00e1c) v\u00e0 h l\u00e0 hi\u1ec1u cao c\u1ee7a tam gi\u00e1c (chi\u1ec1u cao tam gi\u00e1c b\u1eb1ng \u0111o\u1ea1n th\u1eb3ng h\u1ea1 t\u1eeb \u0111\u1ec9nh xu\u1ed1ng \u0111\u00e1y)<\/p>\n<p dir=\"ltr\" style=\"text-align: center\">\u00a0<\/p>\n<p dir=\"ltr\"><img decoding=\"async\" class=\"lazyload\" src=\"https:\/\/external-content.duckduckgo.com\/iu\/?u=https:\/\/vnmedia2.monkeyuni.net\/upload\/web\/img\/dien-tich-hinh-tam-giac-3.jpg\" alt=\"Tam gi\u00e1c \u0111\u1ec1u. (\u1ea2nh: S\u01b0u t\u1ea7m internet)\" width=\"100%\"><\/p>\n<p dir=\"ltr\"><em>V\u00ed du: T\u00ednh di\u1ec7n t\u00edch c\u1ee7a tam gi\u00e1c \u0111\u1ec1u c\u00f3:<\/em><\/p>\n<p dir=\"ltr\"><em>a, \u0110\u1ed9 d\u00e0i m\u1ed9t c\u1ea1nh tam gi\u00e1c b\u1eb1ng 6cm v\u00e0 \u0111\u01b0\u1eddng cao b\u1eb1ng 10cm<\/em><\/p>\n<p dir=\"ltr\"><em>b, \u0110\u1ed9 d\u00e0i m\u1ed9t c\u1ea1nh tam gi\u00e1c b\u1eb1ng 4cm v\u00e0 \u0111\u01b0\u1eddng cao b\u1eb1ng 5cm<\/em><\/p>\n<p dir=\"ltr\"><em>L\u1eddi gi\u1ea3i<\/em><\/p>\n<p dir=\"ltr\"><em>a, Di\u1ec7n t\u00edch h\u00ecnh tam gi\u00e1c l\u00e0:<\/em><\/p>\n<p dir=\"ltr\"><em>(6 x 10) : 2 = 30 (cm2)<\/em><\/p>\n<p dir=\"ltr\"><em>\u0110\u00e1p s\u1ed1: 30cm2<\/em><\/p>\n<p dir=\"ltr\"><em>b, Di\u1ec7n t\u00edch h\u00ecnh tam gi\u00e1c l\u00e0:<\/em><\/p>\n<p dir=\"ltr\"><em>(4 x 5) : 2 = 10 (cm2)<\/em><\/p>\n<p dir=\"ltr\"><em>\u0110\u00e1p s\u1ed1: 10cm2<\/em><\/p>\n<h2 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Cach_tinh_dien_tich_tam_giac_vuong\"><\/span>C\u00e1ch t\u00ednh di\u1ec7n t\u00edch tam gi\u00e1c vu\u00f4ng<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>C\u00f4ng th\u1ee9c t\u00ednh di\u1ec7n t\u00edch tam gi\u00e1c vu\u00f4ng\u00a0b\u1eb1ng \u00bd t\u00edch c\u1ee7a chi\u1ec1u cao v\u1edbi chi\u1ec1u d\u00e0i \u0111\u00e1y: S = (a x b)\/ 2. Trong \u0111\u00f3: a v\u00e0 b l\u00e0 \u0111\u1ed9 d\u00e0i 2 c\u1ea1nh g\u00f3c vu\u00f4ng. V\u00ec tam gi\u00e1c vu\u00f4ng c\u00f3 2 c\u1ea1nh g\u00f3c vu\u00f4ng, n\u00ean chi\u1ec1u cao s\u1ebd \u1ee9ng v\u1edbi 1 c\u1ea1nh g\u00f3c vu\u00f4ng, c\u00f9ng v\u1edbi chi\u1ec1u d\u00e0i \u0111\u00e1y s\u1ebd \u1ee9ng v\u1edbi c\u1ea1nh g\u00f3c vu\u00f4ng c\u00f2n l\u1ea1i.<\/p>\n<p dir=\"ltr\"><img decoding=\"async\" class=\"lazyload\" src=\"https:\/\/external-content.duckduckgo.com\/iu\/?u=https:\/\/vnmedia2.monkeyuni.net\/upload\/web\/img\/dien-tich-hinh-tam-giac-4.jpg\" alt=\"H\u00ecnh \u1ea3nh tam gi\u00e1c vu\u00f4ng. (\u1ea2nh: S\u01b0u t\u1ea7m internet)\" width=\"100%\"><\/p>\n<p dir=\"ltr\"><em>V\u00ed d\u1ee5: T\u00ednh di\u1ec7n t\u00edch c\u1ee7a tam gi\u00e1c vu\u00f4ng c\u00f3:<\/em><\/p>\n<p dir=\"ltr\"><em>a, Hai c\u1ea1nh g\u00f3c vu\u00f4ng l\u1ea7n l\u01b0\u1ee3t l\u00e0 3cm v\u00e0 4cm<\/em><\/p>\n<p dir=\"ltr\"><em>b, Hai c\u1ea1nh g\u00f3c vu\u00f4ng l\u1ea7n l\u01b0\u1ee3t l\u00e0 6m v\u00e0 8m<\/em><\/p>\n<p dir=\"ltr\"><em>L\u1eddi gi\u1ea3i:<\/em><\/p>\n<p dir=\"ltr\"><em>a, Di\u1ec7n t\u00edch c\u1ee7a h\u00ecnh tam gi\u00e1c l\u00e0:<\/em><\/p>\n<p dir=\"ltr\"><em>S tam gi\u00e1c = (3 x 4) : 2 = 6 (cm2)<\/em><\/p>\n<p dir=\"ltr\"><em>\u0110\u00e1p s\u1ed1: 6cm2<\/em><\/p>\n<p dir=\"ltr\"><em>b, \u00c1p d\u1ee5ng c\u00e1ch t\u00ednh di\u1ec7n t\u00edch tam gi\u00e1c ta c\u00f3:<\/em><\/p>\n<p dir=\"ltr\"><em>S tam gi\u00e1c =(6 x 8) : 2 = 24 (m2)<\/em><\/p>\n<p dir=\"ltr\"><em>\u0110\u00e1p s\u1ed1: 24m2<\/em><\/p>\n<h2 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Cong_thuc_tinh_dien_tich_tam_giac_vuong_can\"><\/span>C\u00f4ng th\u1ee9c t\u00ednh di\u1ec7n t\u00edch tam gi\u00e1c vu\u00f4ng c\u00e2n<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p dir=\"ltr\">Tam gi\u00e1c vu\u00f4ng c\u00e2n l\u00e0 tam gi\u00e1c v\u1eeba vu\u00f4ng, v\u1eeba c\u00e2n. C\u00e1ch t\u00ednh di\u1ec7n t\u00edch h\u00ecnh tam gi\u00e1c vu\u00f4ng c\u00e2n l\u00e0 S = 1\/2 x a^2. Trong \u0111\u00f3: a l\u00e0 \u0111\u1ed9 d\u00e0i c\u1ea1nh \u0111\u00e1y c\u1ee7a tam gi\u00e1c.\u00a0<\/p>\n<p dir=\"ltr\"><img loading=\"lazy\" decoding=\"async\" class=\"lazyload\" src=\"https:\/\/external-content.duckduckgo.com\/iu\/?u=https:\/\/vnmedia2.monkeyuni.net\/upload\/web\/img\/dien-tich-hinh-tam-giac-03.jpg\" alt=\"C\u00f4ng th\u1ee9c t\u00ednh di\u1ec7n t\u00edch tam gi\u00e1c vu\u00f4ng c\u00e2n. (\u1ea2nh: Internet)\" width=\"800\" height=\"392\"><\/p>\n<h2 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Cong_thuc_tinh_dien_tich_tam_giac_trong_he_toa_do_Oxyz\"><\/span>C\u00f4ng th\u1ee9c t\u00ednh di\u1ec7n t\u00edch tam gi\u00e1c trong h\u1ec7 t\u1ecda \u0111\u1ed9 Oxyz<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p dir=\"ltr\">Tr\u00ean l\u00fd thuy\u1ebft, ta c\u00f3 th\u1ec3 d\u00f9ng c\u00e1c c\u00f4ng th\u1ee9c t\u00ednh tam gi\u00e1c ph\u1eb3ng cho tam gi\u00e1c trong kh\u00f4ng gian Oxyz. Nh\u01b0ng nh\u01b0 v\u1eady s\u1ebd g\u1eb7p nhi\u1ec1u kh\u00f3 kh\u0103n khi t\u00ednh to\u00e1n. V\u1eady n\u00ean, trong kh\u00f4ng gian Oxyz, ta s\u1ebd t\u00ednh di\u1ec7n t\u00edch tam gi\u00e1c d\u1ef1a v\u00e0o t\u00edch c\u00f3 h\u01b0\u1edbng.<\/p>\n<p dir=\"ltr\"><img decoding=\"async\" class=\"lazyload\" src=\"https:\/\/external-content.duckduckgo.com\/iu\/?u=https:\/\/vnmedia2.monkeyuni.net\/upload\/web\/img\/dien-tich-hinh-tam-giac-5.jpg\" alt=\"H\u00ecnh \u1ea3nh tam gi\u00e1c trong kh\u00f4ng gian Oxyz. (\u1ea3nh: S\u01b0u t\u1ea7m internet)\" width=\"100%\"><\/p>\n<p dir=\"ltr\">Trong kh\u00f4ng gian Oxyz, cho tam gi\u00e1c ABC. Di\u1ec7n t\u00edch tam gi\u00e1c ABC \u0111\u01b0\u1ee3c t\u00ednh theo c\u00f4ng th\u1ee9c:\u00a0<\/p>\n<p dir=\"ltr\"><img decoding=\"async\" style=\"text-align: center\" class=\"lazyload\" src=\"https:\/\/external-content.duckduckgo.com\/iu\/?u=https:\/\/vnmedia2.monkeyuni.net\/upload\/web\/img\/dien-tich-hinh-tam-giac-1a.jpg\" alt=\"\" width=\"100%\"><\/p>\n<p dir=\"ltr\">V\u00ed d\u1ee5 minh h\u1ecda:<\/p>\n<p dir=\"ltr\">Trong kh\u00f4ng gian Oxyz, cho tam gi\u00e1c ABC c\u00f3 t\u1ecda \u0111\u1ed9 ba \u0111\u1ec9nh l\u1ea7n l\u01b0\u1ee3t l\u00e0 A(-1;1;2), B(1;2;3), C(3;-2;0). T\u00ednh di\u1ec7n t\u00edch tam gi\u00e1c ABC.<\/p>\n<p dir=\"ltr\">B\u00e0i gi\u1ea3i:<\/p>\n<p dir=\"ltr\"><img decoding=\"async\" class=\"lazyload\" src=\"https:\/\/external-content.duckduckgo.com\/iu\/?u=https:\/\/vnmedia2.monkeyuni.net\/upload\/web\/img\/dien-tich-hinh-tam-giac-1b.jpg\" alt=\"\" width=\"100%\"><\/p>\n<table style=\"border-collapse: collapse;margin-left: auto;margin-right: auto;width: 100%;background-color: #fbeeb8\" border=\"1\">\n<tr>\n<td style=\"width: 98.5932%;background-color: #c2e0f4;text-align: center\">H\u1ecdc To\u00e1n th\u1eadt d\u1ec5 d\u00e0ng v\u1edbi Shining Home &#8211; Gia \u0111\u00ecnh Anh Ng\u1eef Math &#8211; \u1ee8ng d\u1ee5ng h\u1ecdc To\u00e1n theo ch\u01b0\u01a1ng tr\u00ecnh GDPT M\u1edbi cho tr\u1ebb M\u1ea7m non v\u00e0 Ti\u1ec3u h\u1ecdc. Click &#8220;T\u1ea3i mi\u1ec5n ph\u00ed&#8221; \u0111\u1ec3 H\u1eccC TH\u1eec NGAY H\u00d4M NAY.\u00a0 <img decoding=\"async\" style=\"margin-left: auto;margin-right: auto\" class=\"lazyload\" src=\"https:\/\/external-content.duckduckgo.com\/iu\/?u=https:\/\/vnmedia2.monkeyuni.net\/upload\/web\/img\/taimienphiMM.png\" width=\"185\"><\/td>\n<\/tr>\n<\/table>\n<h2 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Cac_dang_bai_tap_cach_tinh_dien_tich_tam_giac_co_ban_nang_cao\"><\/span>C\u00e1c d\u1ea1ng b\u00e0i t\u1eadp c\u00e1ch t\u00ednh di\u1ec7n t\u00edch tam gi\u00e1c c\u01a1 b\u1ea3n &amp; n\u00e2ng cao<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p dir=\"ltr\">\u0110\u1ed1i v\u1edbi ki\u1ebfn th\u1ee9c v\u1ec1 h\u00ecnh tam gi\u00e1c, t\u00f9y v\u00e0o m\u1ed7i c\u1ea5p h\u1ecdc s\u1ebd c\u00f3 nh\u1eefng d\u1ea1ng b\u00e0i t\u1eadp ri\u00eang. Nh\u01b0ng v\u1edbi c\u00e1c b\u00e9 \u0111ang trong \u0111\u1ed9 tu\u1ed5i c\u1ea5p 1, s\u1ebd th\u01b0\u1eddng g\u1eb7p nh\u1eefng d\u1ea1ng b\u00e0i t\u1eadp t\u00ednh di\u1ec7n t\u00edch c\u1ee7a h\u00ecnh tam gi\u00e1c nh\u01b0 sau:<\/p>\n<p dir=\"ltr\"><img decoding=\"async\" class=\"lazyload\" src=\"https:\/\/external-content.duckduckgo.com\/iu\/?u=https:\/\/vnmedia2.monkeyuni.net\/upload\/web\/img\/dien-tich-hinh-tam-giac-7.jpg\" alt=\"D\u1ef1a v\u00e0o \u0111\u1eb7c \u0111i\u1ec3m c\u00e1c h\u00ecnh tam gi\u00e1c \u0111\u1ec3 t\u00ednh di\u1ec7n t\u00edch. (\u1ea2nh: S\u01b0u t\u1ea7m internet)\" width=\"100%\"><\/p>\n<h3 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Dang_1_Cach_tinh_dien_tich_tam_giac_khi_biet_do_dai_day_va_chieu_cao\"><\/span>D\u1ea1ng 1: C\u00e1ch t\u00ednh di\u1ec7n t\u00edch tam gi\u00e1c khi bi\u1ebft \u0111\u1ed9 d\u00e0i \u0111\u00e1y v\u00e0 chi\u1ec1u cao<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p dir=\"ltr\">\u0110\u1ed1i v\u1edbi d\u1ea1ng b\u00e0i t\u1eadp n\u00e0y, \u0111\u1ec1 b\u00e0i th\u01b0\u1eddng s\u1ebd cho d\u1eef ki\u1ec7n v\u1ec1 chi\u1ec1u cao v\u00e0 \u0111\u1ed9 d\u00e0i c\u1ea1nh \u0111\u00e1y. N\u00ean c\u00e1c em ch\u1ec9 c\u1ea7n \u00e1p d\u1ee5ng c\u00f4ng th\u1ee9c t\u00ednh tam gi\u00e1c th\u01b0\u1eddng \u0111\u1ec3 t\u00ecm ra \u0111\u00e1p \u00e1n ch\u00ednh x\u00e1c.<\/p>\n<p dir=\"ltr\"><em>V\u00ed d\u1ee5: T\u00ednh di\u1ec7n t\u00edch tam gi\u00e1c th\u01b0\u1eddng v\u00e0 tam gi\u00e1c vu\u00f4ng c\u00f3:<\/em><\/p>\n<p dir=\"ltr\"><em>a) \u0110\u1ed9 d\u00e0i \u0111\u00e1y b\u1eb1ng 32cm v\u00e0 chi\u1ec1u cao b\u1eb1ng 25cm.<\/em><\/p>\n<p dir=\"ltr\"><em>b) Hai c\u1ea1nh g\u00f3c vu\u00f4ng c\u00f3 \u0111\u1ed9 d\u00e0i l\u1ea7n l\u01b0\u1ee3t l\u00e0 3dm v\u00e0 4dm.<\/em><\/p>\n<p dir=\"ltr\"><em>L\u1eddi gi\u1ea3i:<\/em><\/p>\n<p dir=\"ltr\"><em>a) Di\u1ec7n t\u00edch h\u00ecnh tam gi\u00e1c l\u00e0:<\/em><\/p>\n<p dir=\"ltr\"><em>S = 32 x 25 : 2 = 400 (cm2)<\/em><\/p>\n<p dir=\"ltr\"><em>b) Di\u1ec7n t\u00edch h\u00ecnh tam gi\u00e1c l\u00e0:<\/em><\/p>\n<p dir=\"ltr\"><em>S = 3 x 4 : 2 = 6 (dm2)<\/em><\/p>\n<p dir=\"ltr\"><em>\u0110\u00e1p s\u1ed1: a) 400cm2; b) 6dm2<\/em><\/p>\n<h3 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Dang_2_Tinh_do_dai_day_khi_biet_dien_tich_hinh_tam_giac_va_chieu_cao\"><\/span>D\u1ea1ng 2: T\u00ednh \u0111\u1ed9 d\u00e0i \u0111\u00e1y khi bi\u1ebft di\u1ec7n t\u00edch h\u00ecnh tam gi\u00e1c v\u00e0 chi\u1ec1u cao<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p dir=\"ltr\">\u1ede d\u1ea1ng b\u00e0i t\u1eadp c\u00e1ch t\u00ednh h\u00ecnh tam gi\u00e1c n\u00e0y, d\u1eef ki\u1ec7n \u0111\u1ec1 b\u00e0i s\u1ebd cho bi\u1ebft th\u00f4ng s\u1ed1 c\u1ee7a chi\u1ec1u cao v\u00e0 di\u1ec7n t\u00edch h\u00ecnh tam gi\u00e1c, y\u00eau c\u1ea7u h\u1ecdc sinh s\u1ebd t\u00ednh \u0111\u1ed9 d\u00e0i \u0111\u00e1y. N\u00ean t\u1eeb c\u00f4ng th\u1ee9c t\u00ednh di\u1ec7n t\u00edch, ta suy ra c\u00f4ng th\u1ee9c t\u00ednh \u0111\u1ed9 d\u00e0i \u0111\u00e1y: a = S x 2 : h<\/p>\n<p dir=\"ltr\"><em>V\u00ed d\u1ee5: Cho h\u00ecnh tam gi\u00e1c v\u1edbi di\u1ec7n t\u00edch S b\u1eb1ng 4800cm2, chi\u1ec1u cao l\u00e0 80cm. T\u00ednh \u0111\u1ed9 d\u00e0i c\u1ea1nh \u0111\u00e1y b\u1eb1ng bao nhi\u00eau?<\/em><\/p>\n<p dir=\"ltr\"><em>L\u1eddi gi\u1ea3i:<\/em><\/p>\n<p dir=\"ltr\"><em>\u0110\u1ed9 d\u00e0i c\u1ea1nh \u0111\u00e1y c\u1ee7a h\u00ecnh tam gi\u00e1c l\u00e0:<\/em><\/p>\n<p dir=\"ltr\"><em>4800 x 2 : 80 = 120 (cm)<\/em><\/p>\n<p dir=\"ltr\"><em>\u0110\u00e1p s\u1ed1: 120cm<\/em><\/p>\n<h3 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Dang_3_Tinh_chieu_cao_khi_biet_dien_tich_tam_giac_va_do_dai_day\"><\/span>D\u1ea1ng 3: T\u00ednh chi\u1ec1u cao khi bi\u1ebft di\u1ec7n t\u00edch tam gi\u00e1c v\u00e0 \u0111\u1ed9 d\u00e0i \u0111\u00e1y<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p dir=\"ltr\">C\u0169ng t\u1eeb c\u00f4ng th\u1ee9c t\u00ednh di\u1ec7n t\u00edch c\u1ee7a h\u00ecnh tam gi\u00e1c, ta c\u0169ng s\u1ebd suy ra c\u00f4ng th\u1ee9c t\u00ednh chi\u1ec1u cao c\u1ee7a h\u00ecnh nh\u01b0 sau: h = S x 2 : a<\/p>\n<p dir=\"ltr\"><em>V\u00ed d\u1ee5: Cho h\u00ecnh tam gi\u00e1c, bi\u1ebft di\u1ec7n t\u00edch S b\u1eb1ng 1125cm2, \u0111\u1ed9 d\u00e0i \u0111\u00e1y b\u1eb1ng 50cm, t\u00ednh chi\u1ec1u cao c\u1ee7a h\u00ecnh tam gi\u00e1c \u0111\u00f3.<\/em><\/p>\n<p dir=\"ltr\"><em>L\u1eddi gi\u1ea3i:<\/em><\/p>\n<p dir=\"ltr\"><em>Chi\u1ec1u cao c\u1ee7a h\u00ecnh tam gi\u00e1c l\u00e0:<\/em><\/p>\n<p dir=\"ltr\"><em>1125 x 2 : 50 = 45 (cm)<\/em><\/p>\n<p dir=\"ltr\"><em>\u0110\u00e1p s\u1ed1: 45cm<\/em><\/p>\n<h2 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Bai_tap_toan_tinh_dien_tich_hinh_tam_giac_de_be_luyen_tap\"><\/span>B\u00e0i t\u1eadp to\u00e1n t\u00ednh di\u1ec7n t\u00edch h\u00ecnh tam gi\u00e1c \u0111\u1ec3 b\u00e9 luy\u1ec7n t\u1eadp<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p dir=\"ltr\">D\u1ef1a v\u00e0o nh\u1eefng ki\u1ebfn th\u1ee9c tr\u00ean, d\u01b0\u1edbi \u0111\u00e2y l\u00e0 t\u1ed5ng h\u1ee3p m\u1ed9t s\u1ed1 b\u00e0i t\u1eadp t\u00ednh di\u1ec7n t\u00edch c\u1ee7a h\u00ecnh vu\u00f4ng \u0111\u1ec3 b\u00e9 c\u00f3 th\u1ec3 luy\u1ec7n t\u1eadp:<\/p>\n<p dir=\"ltr\">B\u00e0i 1: T\u00ednh di\u1ec7n t\u00edch tam gi\u00e1c MDC (h\u00ecnh v\u1ebd d\u01b0\u1edbi). Bi\u1ebft h\u00ecnh ch\u1eef nh\u1eadt ABCD c\u00f3 AB = 20cm, BC = 15cm.<\/p>\n<p dir=\"ltr\"><img loading=\"lazy\" decoding=\"async\" style=\"margin-left: auto;margin-right: auto\" class=\"lazyload\" src=\"https:\/\/external-content.duckduckgo.com\/iu\/?u=https:\/\/vnmedia2.monkeyuni.net\/upload\/web\/img\/dien-tich-hinh-tam-giac-02.jpg\" alt=\"\" width=\"338\" height=\"247\"><\/p>\n<p dir=\"ltr\">B\u00e0i 2: T\u00ednh chi\u1ec1u cao AH c\u1ee7a h\u00ecnh tam gi\u00e1c ABC vu\u00f4ng t\u1ea1i A. Bi\u1ebft: AB = 60cm, AC = 80cm, BC = 100cm.<\/p>\n<p dir=\"ltr\">B\u00e0i 3: M\u1ed9t h\u00ecnh tam gi\u00e1c c\u00f3 \u0111\u00e1y d\u00e0i 16cm, chi\u1ec1u cao = 3\/4 \u0111\u1ed9 d\u00e0i \u0111\u00e1y. T\u00ednh di\u1ec7n t\u00edch h\u00ecnh tam gi\u00e1c \u0111\u00f3.<\/p>\n<p dir=\"ltr\">B\u00e0i 4: M\u1ed9t mi\u1ebfng \u0111\u1ea5t h\u00ecnh tam gi\u00e1c c\u00f3 S = 288m2, m\u1ed9t c\u1ea1nh \u0111\u00e1y b\u1eb3ng 32cm. H\u1ecfi \u0111\u1ec3 S mi\u1ebfng \u0111\u1ea5t t\u0103ng th\u00eam 72m2 th\u00ec ph\u1ea3i t\u0103ng c\u1ea1nh \u0111\u00e1y \u0111\u00e3 cho th\u00eam bao nhi\u00eau m\u00e9t?<\/p>\n<p dir=\"ltr\">B\u00e0i 5: Chi\u1ebfc kh\u0103n qu\u00e0ng h\u00ecnh tam gi\u00e1c c\u00f3 \u0111\u00e1y l\u00e0 5.6dm v\u00e0 chi\u1ec1u cao 20cm. H\u00e3y t\u00ednh di\u1ec7n t\u00edch chi\u1ebfc kh\u0103n qu\u00e0ng \u0111\u00f3.<\/p>\n<p dir=\"ltr\">B\u00e0i 6: M\u1ed9t khu v\u01b0\u1eddn h\u00ecnh tam gi\u00e1c c\u00f3 S = 384m2, chi\u1ec1u cao 24m. H\u1ecfi c\u1ea1nh \u0111\u00e1y l\u00e0 bao nhi\u00eau?<\/p>\n<p dir=\"ltr\">B\u00e0i 7: M\u1ed9t c\u00e1i s\u00e2n h\u00ecnh tam gi\u00e1c c\u00f3 c\u1ea1nh \u0111\u00e1y l\u00e0 36m v\u00e0 g\u1ea5p 3 l\u1ea7n chi\u1ec1u cao. T\u00ednh di\u1ec7n t\u00edch c\u1ee7a s\u00e2n.<\/p>\n<p dir=\"ltr\">B\u00e0i 8: Cho h\u00ecnh tam gi\u00e1c vu\u00f4ng ABC (A l\u00e0 g\u00f3c vu\u00f4ng). Bi\u1ebft \u0111\u1ed9 d\u00e0i c\u1ea1nh AC = 12dm, \u0111\u1ed9 d\u00e0i AB = 90cm. H\u00e3y t\u00ednh di\u1ec7n t\u00edch tam gi\u00e1c ABC?<\/p>\n<p dir=\"ltr\">B\u00e0i 9: Cho h\u00ecnh tam gi\u00e1c vu\u00f4ng ABC t\u1ea1i A. Bi\u1ebft AC = 2.2dm, AB = 50cm. H\u00e3y t\u00ednh di\u1ec7n t\u00edch h\u00ecnh tam gi\u00e1c ABC.<\/p>\n<p dir=\"ltr\">B\u00e0i 10: H\u00ecnh tam gi\u00e1c MNP c\u00f3 chi\u1ec1u cao MH = 25cm v\u00e0 c\u00f3 S = 2dm2. T\u00ednh \u0111\u1ed9 d\u00e0i \u0111\u00e1y NP c\u1ee7a h\u00ecnh tam gi\u00e1c \u0111\u00f3.<\/p>\n<p dir=\"ltr\">B\u00e0i 11: M\u1ed9t qu\u00e1n \u0103n l\u1ea1 c\u00f3 h\u00ecnh d\u1ea1ng l\u00e0 1 tam gi\u00e1c c\u00f3 t\u1ed5ng c\u1ea1nh \u0111\u00e1y v\u00e0 chi\u1ec1u cao l\u00e0 24dm, c\u1ea1nh \u0111\u00e1y b\u1eb1ng 1515 chi\u1ec1u cao. T\u00ednh di\u1ec7n t\u00edch qu\u00e1n \u0103n \u0111\u00f3.<\/p>\n<p dir=\"ltr\">B\u00e0i 12: Cho tam gi\u00e1c ABC c\u00f3 \u0111\u00e1y BC = 2cm. H\u1ecfi ph\u1ea3i k\u00e9o d\u00e0i BC th\u00eam bao nhi\u00eau \u0111\u1ec3 \u0111\u01b0\u1ee3c tam giac BD c\u00f3 di\u1ec7n t\u00edch g\u1ea5p r\u01b0\u1ee1i di\u1ec7n t\u00edch tam gi\u00e1c ABC.<\/p>\n<p dir=\"ltr\">B\u00e0i 13: M\u1ed9t h\u00ecnh tam gi\u00e1c c\u00f3 c\u1ea1nh \u0111\u00e1y b\u1eb1ng 2\/3 chi\u1ec1u cao. N\u1ebfu k\u00e9o d\u00e0i c\u1ea1nh \u0111\u00e1y th\u00eam 30dm th\u00ec di\u1ec7n t\u00edch c\u1ee7a h\u00ecnh tam gi\u00e1c t\u0103ng th\u00eam 27m2. T\u00ednh di\u1ec7n t\u00edch h\u00ecnh tam gi\u00e1c \u0111\u00f3.<\/p>\n<p dir=\"ltr\">B\u00e0i 14: M\u1ed9t h\u00ecnh tam gi\u00e1c c\u00f3 c\u1ea1nh \u0111\u00e1y b\u1eb1ng 7\/4 chi\u1ec1u cao. N\u1ebfu k\u00e9o d\u00e0i c\u1ea1nh \u0111\u00e1y th\u00eam 5m th\u00ec di\u1ec7n t\u00edch c\u1ee7a h\u00ecnh tam gi\u00e1c t\u0103ng th\u00eam 30m2.\u00a0 T\u00ednh di\u1ec7n t\u00edch h\u00ecnh tam gi\u00e1c \u0111\u00f3.<\/p>\n<p dir=\"ltr\">B\u00e0i 15: Cho m\u1ed9t tam gi\u00e1c ABC vu\u00f4ng \u1edf A. N\u1ebfu k\u00e9o d\u00e0i AC v\u1ec1 ph\u00eda C m\u1ed9t \u0111o\u1ea1n CD d\u00e0i 8cm th\u00ec tam gi\u00e1c ABC tr\u1edf th\u00e0nh tam gi\u00e1c vu\u00f4ng c\u00e2n ABD v\u00e0 di\u1ec7n t\u00edch t\u0103ng th\u00eam 144cm2. T\u00ednh di\u1ec7n t\u00edch tam gi\u00e1c vu\u00f4ng ABC.<\/p>\n<h2 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Bi_quyet_giup_be_ghi_nho_cong_thuc_tam_giac_tinh_dien_tich_hieu_qua\"><\/span>B\u00ed quy\u1ebft gi\u00fap b\u00e9 ghi nh\u1edb c\u00f4ng th\u1ee9c tam gi\u00e1c t\u00ednh di\u1ec7n t\u00edch hi\u1ec7u qu\u1ea3<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p dir=\"ltr\">\u0110\u1ed1i v\u1edbi ki\u1ebfn th\u1ee9c li\u00ean quan t\u1edbi di\u1ec7n t\u00edch h\u00ecnh tam gi\u00e1c s\u1ebd c\u00f3 nhi\u1ec1u d\u1ea1ng b\u00e0i ph\u1ee9c t\u1ea1p, c\u0169ng nh\u01b0 nhi\u1ec1u n\u1ed9i dung ph\u1ea3i h\u1ecdc. \u0110\u1ec3 gi\u00fap con l\u0129nh h\u1ed9i ki\u1ebfn th\u1ee9c hi\u1ec7u qu\u1ea3, d\u01b0\u1edbi \u0111\u00e2y l\u00e0 m\u1ed9t s\u1ed1 b\u00ed quy\u1ebft m\u00e0 b\u1ed1 m\u1eb9 c\u00f3 th\u1ec3 tham kh\u1ea3o th\u00eam:<\/p>\n<h3 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Nam_chac_cac_kien_thuc_co_ban_va_cong_thuc_hinh_tam_giac_khi_tinh_dien_tich\"><\/span>N\u1eafm ch\u1eafc c\u00e1c ki\u1ebfn th\u1ee9c c\u01a1 b\u1ea3n v\u00e0 c\u00f4ng th\u1ee9c h\u00ecnh tam gi\u00e1c khi t\u00ednh di\u1ec7n t\u00edch<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p dir=\"ltr\">B\u1ed1 m\u1eb9 h\u00e3y th\u01b0\u1eddng xuy\u00ean ki\u1ec3m tra ki\u1ebfn th\u1ee9c v\u1ec1 m\u00f4n h\u1ecdc hay ri\u00eang l\u1ebb ph\u1ea7n di\u1ec7n t\u00edch h\u00ecnh tam gi\u00e1c \u0111\u1ec3 bi\u1ebft \u0111\u01b0\u1ee3c n\u0103ng l\u1ef1c h\u1ecdc t\u1eadp c\u1ee7a tr\u1ebb \u0111\u1ebfn \u0111\u00e2u. C\u1ee5 th\u1ec3, h\u00e3y th\u1eed \u0111\u1eb7t ra nh\u1eefng\u00a0c\u00e2u h\u1ecfi li\u00ean quan t\u1edbi c\u00f4ng th\u1ee9c t\u00ednh di\u1ec7n t\u00edch c\u1ee7a h\u00ecnh tam gi\u00e1c b\u1ea5t k\u1ef3, xem b\u00e0i v\u1edf c\u1ee7a con,\u2026.<\/p>\n<p dir=\"ltr\">Th\u00f4ng qua vi\u1ec7c n\u00e0y s\u1ebd gi\u00fap b\u1ea1n bi\u1ebft \u0111\u01b0\u1ee3c b\u00e9 h\u1ecdc t\u1eadp nh\u01b0 th\u1ebf n\u00e0o, ph\u1ea7n n\u00e0o con c\u00f2n y\u1ebfu \u0111\u1ec3 ti\u1ebfn h\u00e0nh h\u01b0\u1edbng d\u1eabn v\u00e0 c\u1ee7ng c\u1ed1 l\u1ea1i k\u1ecbp th\u1eddi.<\/p>\n<h3 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Xay_dung_nen_tang_toan_hoc_vung_chac_cho_be_cung_Shining_Home_%E2%80%93_Gia_dinh_Anh_Ngu_Math\"><\/span>X\u00e2y d\u1ef1ng n\u1ec1n t\u1ea3ng to\u00e1n h\u1ecdc v\u1eefng ch\u1eafc cho b\u00e9 c\u00f9ng Shining Home &#8211; Gia \u0111\u00ecnh Anh Ng\u1eef Math<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p dir=\"ltr\">V\u1edbi to\u00e1n h\u00ecnh ch\u1eafc h\u1eb3n n\u1ebfu kh\u00f4ng c\u00f3 ph\u01b0\u01a1ng ph\u00e1p d\u1ea1y h\u1ecdc \u0111\u00fang, tr\u1ebb s\u1ebd r\u1ea5t nhanh ch\u00e1n, c\u0169ng nh\u01b0 c\u1ea3m th\u1ea5y vi\u1ec7c h\u1ecdc kh\u00e1 kh\u00f3. Ch\u00ednh v\u00ec v\u1eady, \u0111\u1ec3 gi\u00fap con c\u00f3 s\u1ef1 h\u1ee9ng th\u00fa h\u01a1n trong khi h\u1ecdc to\u00e1n n\u00f3i chung, to\u00e1n h\u00ecnh n\u00f3i ri\u00eang th\u00ec b\u1ed1 m\u1eb9 c\u00f3 th\u1ec3 ch\u1ecdn Shining Home &#8211; Gia \u0111\u00ecnh Anh Ng\u1eef Math \u0111\u1ec3 \u0111\u1ed3ng h\u00e0nh c\u00f9ng v\u1edbi tr\u1ebb.<\/p>\n<p dir=\"ltr\" style=\"text-align: center\"><iframe loading=\"lazy\" title=\"Gi\u1edbi thi\u1ec7u \u1ee9ng d\u1ee5ng Monkey Math\" width=\"1020\" height=\"574\" src=\"https:\/\/www.youtube.com\/embed\/7DsjpvHFrOs?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe><\/p>\n<p dir=\"ltr\">Shining Home &#8211; Gia \u0111\u00ecnh Anh Ng\u1eef Math l\u00e0 \u1ee9ng d\u1ee5ng h\u1ecdc to\u00e1n ti\u1ebfng Anh ti\u00eau chu\u1ea9n M\u1ef9 trong gi\u1ea3ng d\u1ea1y To\u00e1n h\u1ecdc \u0111\u1ed1i v\u1edbi h\u1ecdc sinh m\u1ea7m non, ti\u1ec3u h\u1ecdc v\u00e0 trung h\u1ecdc (Common Core State Standards) v\u1edbi c\u00e1c chuy\u00ean \u0111\u1ec1 ch\u00ednh nh\u01b0:<\/p>\n<ul>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">\u0110\u1ebfm v\u00e0 T\u1eadp h\u1ee3p s\u1ed1 (Count &amp; Cardinality)<\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">Ph\u00e9p t\u00ednh v\u00e0 T\u01b0 duy \u0110\u1ea1i s\u1ed1 (Operations and Algebraic Thinking)<\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">S\u1ed1 v\u00e0 Ph\u00e9p t\u00ednh h\u1ec7 Th\u1eadp ph\u00e2n (Number &amp; Operations in Base Ten)<\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">\u0110o l\u01b0\u1eddng (Measurement)<\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">H\u00ecnh h\u1ecdc (Geometry)<\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">Th\u1ed1ng k\u00ea v\u00e0 bi\u1ec3u \u0111\u1ed3 (Data &amp; Graph)<\/p>\n<\/li>\n<\/ul>\n<p dir=\"ltr\">B\u00ean c\u1ea1nh \u0111\u00f3, n\u1ed9i dung b\u00e0i h\u1ecdc \u0111\u1ec1u \u0111\u01b0\u1ee3c x\u00e2y d\u1ef1ng b\u00e1m s\u00e1t ch\u01b0\u01a1ng tr\u00ecnh GDPT m\u1edbi c\u1ee7a B\u1ed9 GD\u0110T \u0111\u01b0a ra. T\u1ea5t c\u1ea3 \u0111\u01b0\u1ee3c chia th\u00e0nh nhi\u1ec1u c\u1ea5p \u0111\u1ed9, c\u00e1 nh\u00e2n h\u00f3a theo t\u1eebng \u0111\u1ed9 tu\u1ed5i \u0111\u1ec3 b\u1ed1 m\u1eb9 d\u1ec5 d\u00e0ng l\u1ef1a ch\u1ecdn ph\u00f9 h\u1ee3p v\u1edbi tr\u00ecnh \u0111\u1ed9 c\u1ee7a b\u00e9.<\/p>\n<p dir=\"ltr\">\u0110\u1ec3 t\u1ea1o \u0111\u01b0\u1ee3c s\u1ef1 h\u1ee9ng th\u00fa khi cho b\u00e9 h\u1ecdc to\u00e1n, \u0111\u1ed9i ng\u0169 chuy\u00ean gia c\u1ee7a Shining Home &#8211; Gia \u0111\u00ecnh Anh Ng\u1eef \u0111\u00e3 x\u00e2y d\u1ef1ng c\u00e1c b\u00e0i h\u1ecdc v\u1edbi l\u1ed9 tr\u00ecnh b\u00e0i b\u1ea3n t\u1eeb xem video b\u00e0i gi\u1ea3ng minh h\u1ecda d\u1ec5 hi\u1ec3u, \u0111\u1ebfn h\u1ecdc v\u00e0 \u00f4n t\u1eadp qua c\u00e1c ho\u1ea1t \u0111\u1ed9ng t\u01b0\u01a1ng t\u00e1c v\u00e0 l\u00e0m b\u00e0i t\u1eadp t\u1ea1i s\u00e1ch b\u1ed5 tr\u1ee3 Shining Home &#8211; Gia \u0111\u00ecnh Anh Ng\u1eef Math Workbook (Kh\u00f4ng b\u1eaft bu\u1ed9c).<\/p>\n<p dir=\"ltr\">V\u1edbi s\u1ed1 l\u01b0\u1ee3ng b\u00e0i gi\u1ea3ng, ho\u1ea1t \u0111\u1ed9ng \u0111\u1ed3 s\u1ed9 l\u00ean t\u1edbi 400+ Video b\u00e0i gi\u1ea3ng; h\u01a1n 10.000 ho\u1ea1t \u0111\u1ed9ng t\u01b0\u01a1ng t\u00e1c; 60 ch\u1ee7 \u0111\u1ec1 kh\u00e1c nhau d\u1ef1a tr\u00ean 7 chuy\u00ean \u0111\u1ec1 to\u00e1n h\u1ecdc ch\u00ednh. T\u1ea5t c\u1ea3 \u0111\u1ec1u \u0111\u01b0\u1ee3c minh h\u1ecda r\u00f5 r\u00e0ng v\u1edbi h\u00ecnh \u1ea3nh ng\u1ed9 ngh\u0129nh, \u00e2m thanh s\u1ed1ng \u0111\u1ed9ng, ho\u1ea1t \u0111\u1ed9ng th\u00fa v\u1ecb. Ch\u00ednh \u0111i\u1ec1u n\u00e0y b\u00e9 s\u1ebd c\u1ea3m th\u1ea5y th\u00edch th\u00fa h\u01a1n khi h\u1ecdc t\u1eadp.<\/p>\n<p dir=\"ltr\">H\u01a1n th\u1ebf, Shining Home &#8211; Gia \u0111\u00ecnh Anh Ng\u1eef Math l\u00e0 \u1ee9ng d\u1ee5ng h\u1ecdc t\u1eadp 2 trong 1. Khi v\u1eeba gi\u00fap b\u00e9 ph\u00e1t tri\u1ec3n t\u01b0 duy to\u00e1n h\u1ecdc hi\u1ec7u qu\u1ea3, v\u1eeba gi\u00fap ch\u1ecdn h\u1ecdc ti\u1ebfng Anh m\u1ed9t c\u00e1ch t\u1ef1 nhi\u00ean nh\u1ea5t, khi ch\u01b0\u01a1ng tr\u00ecnh h\u1ecdc \u0111\u1ec1u th\u1ec3 hi\u1ec7n ho\u00e0n to\u00e0n b\u1eb1ng 100% ti\u1ebfng Anh.<\/p>\n<p dir=\"ltr\">T\u1ea3i Shining Home &#8211; Gia \u0111\u00ecnh Anh Ng\u1eef Math cho \u0111i\u1ec7n tho\u1ea1i Android<\/p>\n<p dir=\"ltr\">T\u1ea3i Shining Home &#8211; Gia \u0111\u00ecnh Anh Ng\u1eef Math cho \u0111i\u1ec7n tho\u1ea1i iOS<\/p>\n<p dir=\"ltr\">CLick t\u1ea1i \u0111\u00e2y \u0111\u1ec3 nh\u1eadn t\u01b0 v\u1ea5n Shining Home &#8211; Gia \u0111\u00ecnh Anh Ng\u1eef Math mi\u1ec5n ph\u00ed<\/p>\n<h3 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Cung_be_thuc_hanh_thuong_xuyen\"><\/span>C\u00f9ng b\u00e9 th\u1ef1c h\u00e0nh th\u01b0\u1eddng xuy\u00ean<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p dir=\"ltr\">H\u1ecdc \u0111i \u0111\u00f4i v\u1edbi h\u00e0nh l\u00e0 y\u1ebfu t\u1ed1 quan tr\u1ecdng kh\u00f4ng th\u1ec3 thi\u1ebfu. Vi\u1ec7c th\u1ef1c h\u00e0nh \u1edf \u0111\u00e2y ch\u00ednh l\u00e0 c\u00f9ng b\u00e9 l\u00e0m b\u00e0i t\u1eadp trong SGK, c\u00f9ng con t\u00ecm hi\u1ec3u th\u00eam nhi\u1ec1u d\u1ea1ng b\u00e0i t\u1eadp kh\u00e1c nhau v\u1ec1 di\u1ec7n t\u00edch tam gi\u00e1c, th\u1eed s\u1ee9c v\u1edbi c\u00e1c \u0111\u1ec1 thi th\u1eed, t\u1ed5 ch\u1ee9c c\u00e1c tr\u00f2 ch\u01a1i h\u1ecdc to\u00e1n, t\u1ed5 ch\u1ee9c c\u00e1c cu\u1ed9c thi nh\u1ecf \u0111\u1ec3 b\u00e9 tham gia,\u2026<\/p>\n<p dir=\"ltr\"><img decoding=\"async\" class=\"lazyload\" src=\"https:\/\/external-content.duckduckgo.com\/iu\/?u=https:\/\/vnmedia2.monkeyuni.net\/upload\/web\/img\/dien-tich-hinh-tam-giac-10.jpg\" alt=\"C\u00f9ng b\u00e9 th\u1ef1c h\u00e0nh th\u01b0\u1eddng xuy\u00ean l\u00e0 y\u1ebfu t\u1ed1 kh\u00f4ng th\u1ec3 thi\u1ebfu. (\u1ea3nh: S\u01b0u t\u1ea7m internet) \" width=\"100%\"><\/p>\n<p dir=\"ltr\">Ch\u00ednh v\u00ec \u0111\u01b0\u1ee3c luy\u1ec7n t\u1eadp th\u01b0\u1eddng xuy\u00ean, con s\u1ebd d\u1ec5 d\u00e0ng ghi nh\u1edb \u0111\u01b0\u1ee3c ki\u1ebfn th\u1ee9c m\u00ecnh \u0111\u00e3 \u0111\u01b0\u1ee3c h\u1ecdc, bi\u1ebft c\u00e1ch \u00e1p d\u1ee5ng v\u00e0o th\u1ef1c t\u1ebf v\u00e0 \u0111\u1eb7c bi\u1ec7t l\u00e0 h\u00ecnh th\u00e0nh t\u01b0 duy s\u00e1ng t\u1ea1o trong qu\u00e1 tr\u00ecnh h\u1ecdc t\u1eadp hi\u1ec7u qu\u1ea3 h\u01a1n.<\/p>\n<table style=\"border-collapse: collapse;margin-left: auto;margin-right: auto;width: 100%;background-color: #fbeeb8\" border=\"1\">\n<tr>\n<td style=\"width: 98.5932%;text-align: center\">Tham gia c\u1ed9ng \u0111\u1ed3ng ba m\u1eb9 Shining Home &#8211; Gia \u0111\u00ecnh Anh Ng\u1eef v\u1edbi h\u01a1n 200.000 ph\u1ee5 huynh s\u1eb5n s\u00e0ng chia s\u1ebb kinh nghi\u1ec7m t\u1ea1i \u0111\u00e2y.  <img decoding=\"async\" style=\"margin-left: auto;margin-right: auto\" class=\"lazyload\" src=\"https:\/\/external-content.duckduckgo.com\/iu\/?u=https:\/\/vnmedia.monkeyuni.net\/upload\/web\/img\/button_dang-ky-ngay-1.png\" width=\"185\"><\/td>\n<\/tr>\n<\/table>\n<h2 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Ung_dung_cua_cong_thuc_dien_tich_hinh_tam_giac_trong_thuc_tien\"><\/span>\u1ee8ng d\u1ee5ng c\u1ee7a c\u00f4ng th\u1ee9c di\u1ec7n t\u00edch h\u00ecnh tam gi\u00e1c trong th\u1ef1c ti\u1ec5n<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p dir=\"ltr\">C\u00f4ng th\u1ee9c di\u1ec7n t\u00edch h\u00ecnh tam gi\u00e1c l\u00e0 m\u1ed9t trong nh\u1eefng c\u00f4ng th\u1ee9c h\u00ecnh h\u1ecdc c\u01a1 b\u1ea3n nh\u1ea5t, \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong nhi\u1ec1u l\u0129nh v\u1ef1c kh\u00e1c nhau c\u1ee7a \u0111\u1eddi s\u1ed1ng, t\u1eeb to\u00e1n h\u1ecdc, v\u1eadt l\u00fd, k\u1ef9 thu\u1eadt \u0111\u1ebfn ki\u1ebfn tr\u00fac, x\u00e2y d\u1ef1ng,&#8230;<\/p>\n<ul>\n<li dir=\"ltr\">Trong to\u00e1n h\u1ecdc, c\u00f4ng th\u1ee9c di\u1ec7n t\u00edch h\u00ecnh tam gi\u00e1c \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 gi\u1ea3i c\u00e1c b\u00e0i to\u00e1n li\u00ean quan \u0111\u1ebfn h\u00ecnh tam gi\u00e1c.<\/li>\n<li dir=\"ltr\">Trong v\u1eadt l\u00fd, c\u00f4ng th\u1ee9c di\u1ec7n t\u00edch h\u00ecnh tam gi\u00e1c \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 t\u00ednh to\u00e1n di\u1ec7n t\u00edch c\u1ee7a c\u00e1c v\u1eadt th\u1ec3 c\u00f3 h\u00ecnh d\u1ea1ng tam gi\u00e1c.<\/li>\n<li dir=\"ltr\">Trong k\u1ef9 thu\u1eadt, c\u00f4ng th\u1ee9c di\u1ec7n t\u00edch h\u00ecnh tam gi\u00e1c \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 t\u00ednh to\u00e1n di\u1ec7n t\u00edch c\u1ee7a c\u00e1c b\u1ed9 ph\u1eadn m\u00e1y m\u00f3c, thi\u1ebft b\u1ecb c\u00f3 h\u00ecnh d\u1ea1ng tam gi\u00e1c.<\/li>\n<li dir=\"ltr\">Trong ki\u1ebfn tr\u00fac, x\u00e2y d\u1ef1ng, c\u00f4ng th\u1ee9c di\u1ec7n t\u00edch h\u00ecnh tam gi\u00e1c \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 t\u00ednh to\u00e1n di\u1ec7n t\u00edch c\u1ee7a c\u00e1c c\u00f4ng tr\u00ecnh ki\u1ebfn tr\u00fac c\u00f3 h\u00ecnh d\u1ea1ng tam gi\u00e1c.<\/li>\n<\/ul>\n<p dir=\"ltr\">Tr\u00ean \u0111\u00e2y l\u00e0 t\u1ed5ng h\u1ee3p nh\u1eefng gi\u1ea3i \u0111\u00e1p v\u1ec1 ki\u1ebfn th\u1ee9c di\u1ec7n t\u00edch h\u00ecnh tam gi\u00e1c. \u0110\u00e2y c\u0169ng l\u00e0 m\u1ed9t d\u1ea1ng to\u00e1n kh\u00e1 kh\u00f3 v\u00e0 quan tr\u1ecdng trong qu\u00e1 tr\u00ecnh h\u1ecdc t\u1eadp c\u1ee7a tr\u1ebb. V\u1eady n\u00ean, b\u1ed1 m\u1eb9 h\u00e3y c\u00f9ng b\u00e9 tham kh\u1ea3o v\u00e0 ti\u1ebfn h\u00e0nh \u00f4n luy\u1ec7n \u0111\u1ec3 gi\u00fap n\u00e2ng cao hi\u1ec7u qu\u1ea3 h\u1ecdc t\u1eadp c\u1ee7a con tr\u1ebb t\u1ed1t h\u01a1n nh\u00e9.<\/p>\n<p>                                    Ngu\u1ed3n tham kh\u1ea3o<\/p>\n<p>Area of Triangle<\/p>\n<p>https:\/\/byjus.com\/maths\/area-of-a-triangle\/<\/p>\n<p>Area of Triangle<\/p>\n<p>https:\/\/www.cuemath.com\/measurement\/area-of-triangle\/<\/p>\n<p>Ngu\u1ed3n: <a href=\"http:\/\/www.ckconitsha.com\/vn\/\">http:\/\/www.ckconitsha.com\/vn\/<\/a> T\u00e1c gi\u1ea3: <a href=\"https:\/\/www.ckconitsha.com\/vn\/author\/nguyenlandung\">Nguy\u1ec5n L\u00e2n d\u0169ng<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Di\u1ec7n t\u00edch h\u00ecnh tam gi\u00e1c l\u00e0 d\u1ea1ng to\u00e1n c\u1ea5p 1 c\u00e1c em s\u1ebd \u0111\u01b0\u1ee3c h\u1ecdc. Nh\u01b0ng v\u00ec trong h\u00ecnh tam gi\u00e1c c\u00f3 nhi\u1ec1u th\u1ec3 lo\u1ea1i kh\u00e1c nhau, n\u00ean l\u01b0\u1ee3ng c\u00f4ng th\u1ee9c c\u0169ng s\u1ebd nhi\u1ec1u h\u01a1n. V\u1eady n\u00ean, \u0111\u1ec3 gi\u00fap c\u00e1c em h\u1ecdc v\u00e0 ghi nh\u1edb ki\u1ebfn th\u1ee9c n\u00e0y hi\u1ec7u qu\u1ea3, h\u00e3y c\u00f9ng Shining Home &#8211;&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[100],"tags":[],"class_list":["post-38004","post","type-post","status-publish","format-standard","hentry","category-kien-thuc"],"_links":{"self":[{"href":"https:\/\/www.ckconitsha.com\/vn\/wp-json\/wp\/v2\/posts\/38004","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.ckconitsha.com\/vn\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.ckconitsha.com\/vn\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.ckconitsha.com\/vn\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.ckconitsha.com\/vn\/wp-json\/wp\/v2\/comments?post=38004"}],"version-history":[{"count":2,"href":"https:\/\/www.ckconitsha.com\/vn\/wp-json\/wp\/v2\/posts\/38004\/revisions"}],"predecessor-version":[{"id":38144,"href":"https:\/\/www.ckconitsha.com\/vn\/wp-json\/wp\/v2\/posts\/38004\/revisions\/38144"}],"wp:attachment":[{"href":"https:\/\/www.ckconitsha.com\/vn\/wp-json\/wp\/v2\/media?parent=38004"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ckconitsha.com\/vn\/wp-json\/wp\/v2\/categories?post=38004"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ckconitsha.com\/vn\/wp-json\/wp\/v2\/tags?post=38004"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}