{"id":13765,"date":"2025-06-04T14:30:59","date_gmt":"2025-06-04T07:30:59","guid":{"rendered":"https:\/\/www.ckconitsha.com\/vn\/?p=13765"},"modified":"2025-07-03T08:35:04","modified_gmt":"2025-07-03T01:35:04","slug":"dien-tich-hinh-tron-la-gi-cong-thuc-va-bai-tap-van-dung-chi-tiet","status":"publish","type":"post","link":"https:\/\/www.ckconitsha.com\/vn\/dien-tich-hinh-tron-la-gi-cong-thuc-va-bai-tap-van-dung-chi-tiet\/","title":{"rendered":"Di\u1ec7n t\u00edch h\u00ecnh tr\u00f2n l\u00e0 g\u00ec? C\u00f4ng th\u1ee9c v\u00e0 b\u00e0i t\u1eadp v\u1eadn d\u1ee5ng chi ti\u1ebft"},"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\/dien-tich-hinh-tron-la-gi-cong-thuc-va-bai-tap-van-dung-chi-tiet\/#On_tap_khai_niem_hinh_tron\" >\u00d4n t\u1eadp kh\u00e1i ni\u1ec7m h\u00ecnh tr\u00f2n<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.ckconitsha.com\/vn\/dien-tich-hinh-tron-la-gi-cong-thuc-va-bai-tap-van-dung-chi-tiet\/#Cong_thuc_tinh_dien_tich_hinh_tron\" >C\u00f4ng th\u1ee9c t\u00ednh di\u1ec7n t\u00edch h\u00ecnh tr\u00f2n<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.ckconitsha.com\/vn\/dien-tich-hinh-tron-la-gi-cong-thuc-va-bai-tap-van-dung-chi-tiet\/#Khai_niem\" >Kh\u00e1i ni\u1ec7m<\/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\/dien-tich-hinh-tron-la-gi-cong-thuc-va-bai-tap-van-dung-chi-tiet\/#Cong_thuc_tinh_dien_tich_hinh_tron-2\" >C\u00f4ng th\u1ee9c t\u00ednh di\u1ec7n t\u00edch h\u00ecnh tr\u00f2n<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.ckconitsha.com\/vn\/dien-tich-hinh-tron-la-gi-cong-thuc-va-bai-tap-van-dung-chi-tiet\/#Cach_tinh_dien_tich_hinh_tron\" >C\u00e1ch t\u00ednh di\u1ec7n t\u00edch h\u00ecnh tr\u00f2n<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.ckconitsha.com\/vn\/dien-tich-hinh-tron-la-gi-cong-thuc-va-bai-tap-van-dung-chi-tiet\/#Cach_tinh_dien_tich_nua_hinh_tron\" >C\u00e1ch t\u00ednh di\u1ec7n t\u00edch n\u1eeda h\u00ecnh tr\u00f2n<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/www.ckconitsha.com\/vn\/dien-tich-hinh-tron-la-gi-cong-thuc-va-bai-tap-van-dung-chi-tiet\/#Mot_so_dang_bai_tap_tinh_dien_tich_hinh_tron_thuong_gap\" >M\u1ed9t s\u1ed1 d\u1ea1ng b\u00e0i t\u1eadp t\u00ednh di\u1ec7n t\u00edch h\u00ecnh tr\u00f2n th\u01b0\u1eddng g\u1eb7p<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/www.ckconitsha.com\/vn\/dien-tich-hinh-tron-la-gi-cong-thuc-va-bai-tap-van-dung-chi-tiet\/#Dang_1_Tinh_s_hinh_tron_tu_ban_kinh_r_hoac_duong_kinh_d\" >D\u1ea1ng 1: T\u00ednh s h\u00ecnh tr\u00f2n t\u1eeb b\u00e1n k\u00ednh r ho\u1eb7c \u0111\u01b0\u1eddng k\u00ednh d<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/www.ckconitsha.com\/vn\/dien-tich-hinh-tron-la-gi-cong-thuc-va-bai-tap-van-dung-chi-tiet\/#Dang_2_Tinh_dien_tich_hinh_vanh_khan\" >D\u1ea1ng 2: T\u00ednh di\u1ec7n t\u00edch h\u00ecnh v\u00e0nh kh\u0103n<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/www.ckconitsha.com\/vn\/dien-tich-hinh-tron-la-gi-cong-thuc-va-bai-tap-van-dung-chi-tiet\/#Dang_3_Tinh_dien_tich_hinh_bat_ky_co_chua_1_phan_dien_tich_hinh_tron\" >D\u1ea1ng 3: T\u00ednh di\u1ec7n t\u00edch h\u00ecnh b\u1ea5t k\u1ef3 c\u00f3 ch\u1ee9a 1 ph\u1ea7n di\u1ec7n t\u00edch h\u00ecnh tr\u00f2n<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/www.ckconitsha.com\/vn\/dien-tich-hinh-tron-la-gi-cong-thuc-va-bai-tap-van-dung-chi-tiet\/#Dang_4_Bai_toan_tinh_S_tu_d_nang_cao\" >D\u1ea1ng 4: B\u00e0i to\u00e1n t\u00ednh S t\u1eeb d n\u00e2ng cao<\/a><\/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\/dien-tich-hinh-tron-la-gi-cong-thuc-va-bai-tap-van-dung-chi-tiet\/#Bai_tap_ve_tinh_dien_tich_cua_hinh_tron_de_be_tu_luyen\" >B\u00e0i t\u1eadp v\u1ec1 t\u00ednh di\u1ec7n t\u00edch c\u1ee7a h\u00ecnh tr\u00f2n \u0111\u1ec3 b\u00e9 t\u1ef1 luy\u1ec7n<\/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\/dien-tich-hinh-tron-la-gi-cong-thuc-va-bai-tap-van-dung-chi-tiet\/#Meo_giup_be_lam_bai_tap_tinh_dien_tich_hinh_tron_hieu_qua\" >M\u1eb9o gi\u00fap b\u00e9 l\u00e0m b\u00e0i t\u1eadp t\u00ednh di\u1ec7n t\u00edch h\u00ecnh tr\u00f2n 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-14\" href=\"https:\/\/www.ckconitsha.com\/vn\/dien-tich-hinh-tron-la-gi-cong-thuc-va-bai-tap-van-dung-chi-tiet\/#Trang_bi_nen_tang_toan_hoc_vung_chac_cho_be_cung_Shining_Home_%E2%80%93_Gia_dinh_Anh_Ngu_Math\" >Trang b\u1ecb 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-15\" href=\"https:\/\/www.ckconitsha.com\/vn\/dien-tich-hinh-tron-la-gi-cong-thuc-va-bai-tap-van-dung-chi-tiet\/#Nam_chac_kien_thuc_lien_quan_toi_tinh_dien_tich_hinh_tron\" >N\u1eafm ch\u1eafc ki\u1ebfn th\u1ee9c li\u00ean quan t\u1edbi t\u00ednh di\u1ec7n t\u00edch h\u00ecnh tr\u00f2n<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-16\" href=\"https:\/\/www.ckconitsha.com\/vn\/dien-tich-hinh-tron-la-gi-cong-thuc-va-bai-tap-van-dung-chi-tiet\/#Cung_be_thuc_hanh_luyen_tap_thuong_xuyen\" >C\u00f9ng b\u00e9 th\u1ef1c h\u00e0nh, luy\u1ec7n t\u1eadp th\u01b0\u1eddng xuy\u00ean<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-17\" href=\"https:\/\/www.ckconitsha.com\/vn\/dien-tich-hinh-tron-la-gi-cong-thuc-va-bai-tap-van-dung-chi-tiet\/#Ghi_nho_cong_thuc_hinh_tron_qua_bai_tho\" >Ghi nh\u1edb c\u00f4ng th\u1ee9c h\u00ecnh tr\u00f2n qua b\u00e0i th\u01a1<\/a><\/li><\/ul><\/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\/dien-tich-hinh-tron-la-gi-cong-thuc-va-bai-tap-van-dung-chi-tiet\/#Ket_luan\" >K\u1ebft lu\u1eadn<\/a><\/li><\/ul><\/nav><\/div>\n<\/p>\n<p>V\u1edbi vi\u1ec7c \u00e1p d\u1ee5ng c\u00f4ng th\u1ee9c c\u00f3 s\u1eb5n, vi\u1ec7c t\u00ednh di\u1ec7n t\u00edch h\u00ecnh tr\u00f2n s\u1ebd \u0111\u01a1n gi\u1ea3n v\u00e0 d\u1ec5 d\u00e0ng h\u01a1n. V\u1eady n\u00ean, \u0111\u1ec3 bi\u1ebft c\u00f4ng th\u1ee9c v\u00e0 c\u00e1ch gi\u1ea3i b\u00e0i t\u1eadp v\u1ec1 t\u00ednh di\u1ec7n t\u00edch c\u1ee7a h\u00ecnh tr\u00f2n, h\u00e3y c\u00f9ng Shining Home &#8211; Gia \u0111\u00ecnh Anh Ng\u1eef t\u00ecm hi\u1ec3u v\u00e0 gi\u1ea3i \u0111\u00e1p chi ti\u1ebft trong b\u00e0i vi\u1ebft sau \u0111\u00e2y.<\/p>\n<p>                        View all<\/p>\n<h2 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"On_tap_khai_niem_hinh_tron\"><\/span>\u00d4n t\u1eadp kh\u00e1i ni\u1ec7m h\u00ecnh tr\u00f2n<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>H\u00ecnh tr\u00f2n l\u00e0 g\u00ec? Trong h\u00ecnh h\u1ecdc ph\u1eb3ng, h\u00ecnh tr\u00f2n l\u00e0 t\u1eadp h\u1ee3p t\u1ea5t c\u1ea3 c\u00e1c \u0111i\u1ec3m c\u00e1ch m\u1ed9t \u0111i\u1ec3m c\u1ed1 \u0111\u1ecbnh m\u1ed9t kho\u1ea3ng c\u00e1ch b\u1eb1ng nhau. \u0110i\u1ec3m c\u1ed1 \u0111\u1ecbnh \u0111\u00f3 \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 t\u00e2m c\u1ee7a h\u00ecnh tr\u00f2n, c\u00f2n kho\u1ea3ng c\u00e1ch \u0111\u00f3 \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 b\u00e1n k\u00ednh c\u1ee7a h\u00ecnh tr\u00f2n.<\/p>\n<p>H\u00ecnh tr\u00f2n c\u00f3 c\u00e1c \u0111\u1eb7c \u0111i\u1ec3m sau:<\/p>\n<ul>\n<li>H\u00ecnh tr\u00f2n c\u00f3 t\u00ednh \u0111\u1ed1i x\u1ee9ng tr\u00f2n.<\/li>\n<li>\u0110\u01b0\u1eddng k\u00ednh c\u1ee7a h\u00ecnh tr\u00f2n l\u00e0 \u0111o\u1ea1n th\u1eb3ng \u0111i qua t\u00e2m c\u1ee7a h\u00ecnh tr\u00f2n v\u00e0 c\u1eaft h\u00ecnh tr\u00f2n t\u1ea1i hai \u0111i\u1ec3m \u0111\u1ed1i di\u1ec7n.<\/li>\n<li>\u0110\u1ed9 d\u00e0i c\u1ee7a \u0111\u01b0\u1eddng k\u00ednh g\u1ea5p \u0111\u00f4i b\u00e1n k\u00ednh c\u1ee7a h\u00ecnh tr\u00f2n.<\/li>\n<\/ul>\n<h2 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Cong_thuc_tinh_dien_tich_hinh_tron\"><\/span>C\u00f4ng th\u1ee9c t\u00ednh di\u1ec7n t\u00edch h\u00ecnh tr\u00f2n<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p dir=\"ltr\">Trong t\u1ea5t c\u1ea3 c\u00e1c h\u00ecnh trong to\u00e1n h\u1ecdc, h\u00ecnh tr\u00f2n l\u00e0 m\u1ed9t trong nh\u1eefng h\u00ecnh c\u00f3 nhi\u1ec1u c\u00f4ng th\u1ee9c t\u00ednh to\u00e1n nh\u1ea5t, c\u0169ng nh\u01b0 l\u00e0 chuy\u00ean \u0111\u1ec1 kh\u00e1 ph\u1ee9c t\u1ea1p. Trong \u0111\u00f3, ph\u1ea7n t\u00ednh di\u1ec7n t\u00edch c\u1ee7a h\u00ecnh tr\u00f2n l\u00e0 ki\u1ebfn th\u1ee9c m\u00e0 c\u00e1c em h\u1ecdc sinh c\u1ea7n ph\u1ea3i n\u1eafm r\u00f5:<\/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-tron-1.jpg\" alt=\"\u0110\u1eb7c \u0111i\u1ec3m c\u1ee7a h\u00ecnh tr\u00f2n c\u1ea7n n\u1eafm r\u00f5. (\u1ea2nh: S\u01b0u t\u1ea7m internet)\" width=\"100%\"><\/p>\n<h3 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Khai_niem\"><\/span>Kh\u00e1i ni\u1ec7m<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p dir=\"ltr\">Di\u1ec7n t\u00edch c\u1ee7a h\u00ecnh tr\u00f2n \u0111\u01b0\u1ee3c bi\u1ebft \u0111\u1ebfn l\u00e0 ph\u1ea7n di\u1ec7n t\u00edch n\u1eb1m ph\u00eda trong \u0111\u01b0\u1eddng tr\u00f2n, ch\u00fang t\u1ef7 l\u1ec7 thu\u1eadn c\u00f9ng v\u1edbi b\u00ecnh ph\u01b0\u01a1ng b\u00e1n k\u00ednh c\u1ee7a n\u00f3.<\/p>\n<h3 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Cong_thuc_tinh_dien_tich_hinh_tron-2\"><\/span>C\u00f4ng th\u1ee9c t\u00ednh di\u1ec7n t\u00edch h\u00ecnh tr\u00f2n<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p dir=\"ltr\">\u0110\u1ec3 t\u00ednh di\u1ec7n t\u00edch h\u00ecnh tr\u00f2n, m\u1ecdi ng\u01b0\u1eddi s\u1ebd \u00e1p d\u1ee5ng c\u00f4ng th\u1ee9c t\u00edch gi\u1eefa s\u1ed1 PI v\u00e0 b\u00ecnh ph\u01b0\u01a1ng b\u00e1n k\u00ednh c\u1ee7a h\u00ecnh tr\u00f2n \u0111\u00f3. V\u1edbi, c\u00f4ng th\u1ee9c t\u00ednh di\u1ec7n t\u00edch \u0111\u01b0\u1eddng tr\u00f2n nh\u01b0 sau:<\/p>\n<p dir=\"ltr\" style=\"text-align: center\">S = \u03c0R2<\/p>\n<p dir=\"ltr\">Trong \u0111\u00f3:<\/p>\n<ul>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">S: l\u00e0 di\u1ec7n t\u00edch \u0111\u01b0\u1eddng tr\u00f2n<\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">\u03c0: l\u00e0 s\u1ed1 PI, v\u1edbi \u03c0 = 3,14<\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">R: l\u00e0 b\u00e1n k\u00ednh h\u00ecnh tr\u00f2n<\/p>\n<\/li>\n<\/ul>\n<p dir=\"ltr\">Nh\u1eadn x\u00e9t: \u0110\u1ec3 c\u00f3 th\u1ec3 t\u00ednh \u0111\u01b0\u1ee3c di\u1ec7n t\u00edch c\u1ee7a m\u1ed9t h\u00ecnh tr\u00f2n, m\u1ecdi ng\u01b0\u1eddi ph\u1ea3i bi\u1ebft \u0111\u01b0\u1ee3c b\u00e1n k\u00ednh c\u1ee7a h\u00ecnh. M\u1ed9t s\u1ed1 \u0111\u1ea1i l\u01b0\u1ee3ng gi\u00fap c\u00e1c em t\u00ecm \u0111\u01b0\u1ee3c b\u00e1n k\u00ednh c\u1ee7a h\u00ecnh tr\u00f2n v\u00e0 t\u00ednh d\u01b0\u1ee3c S nh\u01b0 sau:<\/p>\n<ul>\n<li dir=\"ltr\">\u0110\u01b0\u1eddng k\u00ednh h\u00ecnh tr\u00f2n: d = 2R =&gt; R = d\/2 =&gt; S = \u03c0d2\/4<\/li>\n<li dir=\"ltr\">Chu vi h\u00ecnh tr\u00f2n: C = \u03c0d = 2\u03c0R =&gt; R = C\/2\u03c0 =&gt; S = C2\/4\u03c0<\/li>\n<\/ul>\n<h2 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Cach_tinh_dien_tich_hinh_tron\"><\/span>C\u00e1ch t\u00ednh di\u1ec7n t\u00edch h\u00ecnh tr\u00f2n<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p dir=\"ltr\">T\u00f9y v\u00e0o t\u1eebng d\u1ea1ng b\u00e0i t\u1eadp y\u00eau c\u1ea7u t\u00ednh S h\u00ecnh tr\u00f2n th\u00ec m\u1ecdi ng\u01b0\u1eddi s\u1ebd c\u00f3 c\u00e1ch l\u00e0m kh\u00e1c nhau. Nh\u01b0ng v\u1ec1 c\u01a1 b\u1ea3n s\u1ebd \u00e1p d\u1ee5ng theo quy tr\u00ecnh sau \u0111\u00e2y.<\/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-tron-2.jpg\" alt=\"D\u1ef1a v\u00e0o c\u00f4ng th\u1ee9c \u0111\u1ec3 t\u00ednh \u0111\u01b0\u1ee3c di\u1ec7n t\u00edch c\u1ee7a m\u1ed9t h\u00ecnh tr\u00f2n. (\u1ea2nh: S\u01b0u t\u1ea7m internet)\" width=\"100%\"><\/p>\n<p dir=\"ltr\">B\u01b0\u1edbc 1: Ph\u00e2n t\u00edch \u0111\u1ec1 b\u00e0i \u0111\u00e3 cho nh\u1eefng d\u1eef ki\u1ec7n g\u00ec \u0111\u1ec3 t\u00ednh to\u00e1n S.<\/p>\n<p dir=\"ltr\">N\u1ebfu \u0111\u1ec1 b\u00e0i \u0111\u00e3 cho R, ch\u1ec9 c\u1ea7n \u00e1p d\u1ee5ng c\u00f4ng th\u1ee9c S = \u03c0R2 ho\u1eb7c S = S = \u03c0(d\/2)2 \u0111\u1ec3 t\u00ednh.<\/p>\n<p dir=\"ltr\">N\u1ebfu \u0111\u1ec1 b\u00e0i ch\u01b0a c\u00f3 \u0111\u1ee7 d\u1eef ki\u1ec7n s\u1ebd chuy\u1ec3n sang ti\u1ebfp b\u01b0\u1edbc 2.<\/p>\n<p dir=\"ltr\">B\u01b0\u1edbc 2: T\u00ecm d\u1eef ki\u1ec7n c\u00f2n thi\u1ebfu =&gt; r<\/p>\n<p dir=\"ltr\">N\u1ebfu \u0111\u1ec1 b\u00e0i cho th\u00f4ng tin v\u1ec1 \u0111\u01b0\u1eddng k\u00ednh, \u0111\u1ec3 t\u00ednh r b\u1ea1n \u00e1p d\u1ee5ng c\u00f4ng th\u1ee9 r = d\/2 (d l\u00e0 \u0111\u01b0\u1eddng k\u00ednh).<\/p>\n<p dir=\"ltr\">N\u1ebfu \u0111\u1ec1 b\u00e0i cho d\u1eef ki\u1ec7n l\u00e0 chu vi h\u00ecnh tr\u00f2n, t\u00ecm r b\u1ea1n s\u1ebd \u00e1p d\u1ee5ng c\u00f4ng th\u1ee9c r = C\/(2.3,14)<\/p>\n<p dir=\"ltr\">B\u01b0\u1edbc 3: T\u00ecm \u0111\u00e1p \u00e1n<\/p>\n<p dir=\"ltr\">T\u1eeb b\u01b0\u1edbc 1 ho\u1eb7c b\u01b0\u1edbc 2, sau khi \u0111\u00e3 t\u00ecm \u0111\u01b0\u1ee3c r, c\u00e1c em ch\u1ec9 c\u1ea7n \u00e1p d\u1ee5ng c\u00f4ng th\u1ee9c t\u00ednh S = \u03c0R2 \u0111\u1ec3 t\u00ecm \u0111\u01b0\u1ee3c \u0111\u00e1p \u00e1n ch\u00ednh x\u00e1c.<\/p>\n<p dir=\"ltr\">C\u00f2n tr\u01b0\u1eddng h\u1ee3p, \u0111\u1ec3 t\u00ednh di\u1ec7n t\u00edch 1 n\u1eeda h\u00ecnh tr\u00f2n, ch\u1ec9 c\u1ea7n \u00e1p d\u1ee5ng c\u00f4ng th\u1ee9c S = \u03c0R2 v\u00e0 chia cho 2 l\u00e0 \u0111\u01b0\u1ee3c.<\/p>\n<table style=\"border-collapse: collapse;width: 100.01%;background-color: #fbeeb8\" border=\"1\">\n<tr>\n<td style=\"width: 98.5932%\">\n<p style=\"text-align: center\">\u0110\u1eeaNG B\u1ece L\u1ee0!!<\/p>\n<p style=\"text-align: center\">Ch\u01b0\u01a1ng tr\u00ecnh h\u1ecdc To\u00e1n b\u1eb1ng ti\u1ebfng Anh, gi\u00fap ph\u00e1t tri\u1ec3n t\u01b0 duy m\u1ed9t c\u00e1ch to\u00e0n di\u1ec7n nh\u1ea5t.<\/p>\n<p style=\"text-align: center\">Nh\u1eadn \u01b0u \u0111\u00e3i l\u00ean \u0111\u1ebfn 40% NGAY T\u1ea0I \u0110\u00c2Y!<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\"><\/p>\n<\/td>\n<\/tr>\n<\/table>\n<h2 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Cach_tinh_dien_tich_nua_hinh_tron\"><\/span>C\u00e1ch t\u00ednh di\u1ec7n t\u00edch n\u1eeda h\u00ecnh tr\u00f2n<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Di\u1ec7n t\u00edch n\u1eeda h\u00ecnh tr\u00f2n l\u00e0 m\u1ed9t trong c\u00e1c c\u00e1ch t\u00ednh h\u00ecnh tr\u00f2n m\u00e0 h\u1ecdc sinh c\u1ea7n ph\u1ea3i bi\u1ebft. Trong \u0111\u00f3, di\u1ec7n t\u00edch n\u1eeda h\u00ecnh tr\u00f2n ch\u00ednh b\u1eb1ng m\u1ed9t n\u1eeda di\u1ec7n t\u00edch h\u00ecnh tr\u00f2n. V\u1edbi, c\u00f4ng th\u1ee9c t\u00ednh s h\u00ecnh tr\u00f2n l\u00e0 S = \u03c0r^2, trong \u0111\u00f3 S l\u00e0 di\u1ec7n t\u00edch, \u03c0 l\u00e0 s\u1ed1 pi (kho\u1ea3ng 3,14), v\u00e0 r l\u00e0 b\u00e1n k\u00ednh c\u1ee7a h\u00ecnh tr\u00f2n.<\/p>\n<p>V\u1eady di\u1ec7n t\u00edch n\u1eeda h\u00ecnh tr\u00f2n \u0111\u01b0\u1ee3c t\u00ednh theo c\u00f4ng th\u1ee9c sau:<\/p>\n<p style=\"text-align: center\">S = (\u03c0r^2)\/2<\/p>\n<p>T\u00f3m l\u1ea1i, \u0111\u1ec3 t\u00ednh di\u1ec7n t\u00edch n\u1eeda h\u00ecnh tr\u00f2n, ta c\u1ea7n th\u1ef1c hi\u1ec7n c\u00e1c b\u01b0\u1edbc sau:<\/p>\n<p>B\u01b0\u1edbc 1: X\u00e1c \u0111\u1ecbnh b\u00e1n k\u00ednh c\u1ee7a h\u00ecnh tr\u00f2n.<\/p>\n<p>B\u01b0\u1edbc 2: \u00c1p d\u1ee5ng c\u00f4ng th\u1ee9c S = (\u03c0r^2)\/2 \u0111\u1ec3 t\u00ednh di\u1ec7n t\u00edch.<\/p>\n<h2 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Mot_so_dang_bai_tap_tinh_dien_tich_hinh_tron_thuong_gap\"><\/span>M\u1ed9t s\u1ed1 d\u1ea1ng b\u00e0i t\u1eadp t\u00ednh di\u1ec7n t\u00edch h\u00ecnh tr\u00f2n th\u01b0\u1eddng g\u1eb7p<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p dir=\"ltr\">V\u1edbi ki\u1ebfn th\u1ee9c v\u1ec1 h\u00ecnh tr\u00f2n, s\u1ebd c\u00f3 nh\u1eefng d\u1ea1ng b\u00e0i t\u1eadp li\u00ean quan t\u1edbi t\u00ednh di\u1ec7n t\u00edch nh\u01b0 sau:<\/p>\n<h3 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Dang_1_Tinh_s_hinh_tron_tu_ban_kinh_r_hoac_duong_kinh_d\"><\/span>D\u1ea1ng 1: T\u00ednh s h\u00ecnh tr\u00f2n t\u1eeb b\u00e1n k\u00ednh r ho\u1eb7c \u0111\u01b0\u1eddng k\u00ednh d<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p dir=\"ltr\">\u1ede d\u1ea1ng b\u00e0i t\u1eadp n\u00e0y s\u1ebd cho d\u1eef ki\u1ec7n l\u00e0 r ho\u1eb7c d, y\u00eau c\u1ea7u h\u1ecdc sinh s\u1ebd t\u00ednh di\u1ec7n t\u00edch c\u1ee7a h\u00ecnh tr\u00f2n \u0111\u00f3.<\/p>\n<p dir=\"ltr\">V\u1ec1 c\u00e1ch gi\u1ea3i, c\u00e1c em c\u00f3 th\u1ec3 d\u1ef1a v\u00e0o c\u00e1ch t\u00ednh tr\u00ean, n\u1ebfu cho r th\u00ec ch\u1ec9 c\u1ea7n \u00e1p d\u1ee5ng c\u00f4ng th\u1ee9c S = \u03c0R2. C\u00f2n n\u1ebfu cho d th\u00ec t\u1eeb d =&gt; r r\u1ed3i t\u1eeb \u0111\u00f3 t\u00ednh \u0111\u01b0\u1ee3c s.<\/p>\n<p dir=\"ltr\"><em>V\u00ed d\u1ee5: Cho h\u00ecnh tr\u00f2n C c\u00f3 \u0111\u01b0\u1eddng k\u00ednh d = 10 cm. H\u00e3y t\u00ednh S h\u00ecnh tr\u00f2n C?<\/em><\/p>\n<p dir=\"ltr\"><em>Gi\u1ea3i: Ta c\u00f3, b\u00e1n k\u00ednh b\u1eb1ng m\u1ed9t n\u1eeda \u0111\u01b0\u1eddng k\u00ednh theo c\u00f4ng th\u1ee9c: R = d\/2<\/em><\/p>\n<p dir=\"ltr\"><em>=&gt; R = 10\/2 = 5 cm<\/em><\/p>\n<p dir=\"ltr\"><em>S h\u00ecnh tr\u00f2n C: S = \u03c0R2 = 3,14.5.2 = 31.4 cm2<\/em><\/p>\n<h3 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Dang_2_Tinh_dien_tich_hinh_vanh_khan\"><\/span>D\u1ea1ng 2: T\u00ednh di\u1ec7n t\u00edch h\u00ecnh v\u00e0nh kh\u0103n<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p dir=\"ltr\">D\u1ea1ng b\u00e0i t\u1eadp n\u00e0y s\u1ebd cho m\u1ed9t h\u00ecnh tr\u00f2n c\u00f3 s\u1eb5n, b\u00ean trong h\u00ecnh tr\u00f2n s\u1ebd c\u00f3 th\u00eam m\u1ed9t h\u00ecnh tr\u00f2n nh\u1ecf (h\u00ecnh v\u00e0nh kh\u0103n) v\u00e0 y\u00eau c\u1ea7u h\u1ecdc sinh t\u00ednh di\u1ec7n t\u00edch ph\u1ea7n h\u00ecnh y\u00eau c\u1ea7u \u0111\u00f3. \u0110\u1ed3ng th\u1eddi, d\u1eef ki\u1ec7n s\u1ebd cho b\u00e1n k\u00ednh c\u1ee7a \u0111\u01b0\u1eddng tr\u00f2n l\u1edbn v\u00e0 \u0111\u01b0\u1eddng tr\u00f2n nh\u1ecf \u0111\u1ec3 c\u00e1c em t\u00ecm \u0111\u01b0\u1ee3c \u0111\u00e1p \u00e1n ch\u00ednh x\u00e1c.<\/p>\n<p dir=\"ltr\"><em>V\u00ed d\u1ee5: Cho h\u00ecnh v\u1ebd, t\u00ednh di\u1ec7n t\u00edch ph\u1ea7n di\u1ec7n t\u00edch h\u00ecnh tr\u00f2n m\u00e0u x\u00e1m. Bi\u1ebft, \u0111\u01b0\u1eddng tr\u00f2n nh\u1ecf b\u00ean trong c\u00f3 r1 = 10cm, \u0111\u01b0\u1eddng tr\u00f2n l\u1edbn b\u00ean ngo\u00e0i c\u00f3 r2 = 15cm.<\/em><\/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-tron-3.jpg\" alt=\"\" width=\"100%\"><\/p>\n<p dir=\"ltr\"><em>Gi\u1ea3i: T\u1eeb h\u00ecnh tr\u00ean, di\u1ec7n t\u00edch ph\u1ea7n t\u00f4 x\u00e1m s\u1ebd b\u1eb1ng hi\u1ec7u c\u1ee7a S h\u00ecnh tr\u00f2n l\u1edbn v\u1edbi r2 v\u00e0 S h\u00ecnh tr\u00f2n nh\u1ecf c\u00f9ng r1. T\u1eeb \u0111\u00f3 ta c\u00f3:<\/em><\/p>\n<ul>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\"><em>S h\u00ecnh tr\u00f2n nh\u1ecf: S1 = \u03c0r12 = 3,14.102 = 314 cm2<\/em><\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\"><em>DT h\u00ecnh tr\u00f2n l\u1edbn: S2 = \u03c0r22 = 3,14.152 = 706,5 cm2<\/em><\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\"><em>Di\u1ec7n t\u00edch h\u00ecnh m\u00e0u x\u00e1m trong h\u00ecnh: S = S2 \u2013 S1 = 706,5 \u2013 314 = 392,5 cm2<\/em><\/p>\n<\/li>\n<\/ul>\n<h3 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Dang_3_Tinh_dien_tich_hinh_bat_ky_co_chua_1_phan_dien_tich_hinh_tron\"><\/span>D\u1ea1ng 3: T\u00ednh di\u1ec7n t\u00edch h\u00ecnh b\u1ea5t k\u1ef3 c\u00f3 ch\u1ee9a 1 ph\u1ea7n di\u1ec7n t\u00edch h\u00ecnh tr\u00f2n<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p dir=\"ltr\">\u0110\u00e2y l\u00e0 d\u1ea1ng b\u00e0i t\u1eadp n\u00e2ng cao, khi cho m\u1ed9t h\u00ecnh v\u1ebd t\u1ed5ng h\u1ee3p nhi\u1ec1u h\u00ecnh kh\u00e1c nhau, c\u00f3 ch\u1ee9a h\u00ecnh tr\u00f2n v\u00e0 y\u00eau c\u1ea7u h\u1ecdc sinh t\u00ednh di\u1ec7n t\u00edch to\u00e0n b\u1ed9. V\u1eady n\u00ean, \u0111\u00f2i h\u1ecfi c\u00e1c em c\u1ea7n n\u1eafm \u0111\u01b0\u1ee3c c\u00e1c c\u00f4ng th\u1ee9c t\u00ednh c\u00e1c lo\u1ea1i h\u00ecnh trong to\u00e1n h\u1ecdc m\u1edbi d\u1ec5 d\u00e0ng gi\u1ea3i \u0111\u01b0\u1ee3c b\u00e0i t\u1eadp n\u00e0y.<\/p>\n<p dir=\"ltr\"><em>V\u00ed d\u1ee5: T\u00ednh di\u1ec7n t\u00edch to\u00e0n b\u1ed9 h\u00ecnh v\u1ebd b\u00ean d\u01b0\u1edbi?<\/em><\/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-tron-4.jpg\" alt=\"\" width=\"100%\"><\/p>\n<p dir=\"ltr\"><em>Gi\u1ea3i: Di\u1ec7n t\u00edch c\u1ee7a to\u00e0n b\u1ed9 h\u00ecnh tr\u00ean s\u1ebd bao g\u1ed3m di\u1ec7n t\u00edch c\u1ee7a h\u00ecnh ch\u1eef nh\u1eadt k\u00edch th\u01b0\u1edbc 10 x 7cm, di\u1ec7n t\u00edch c\u1ee7a 2 n\u1eeda h\u00ecnh tr\u00f2n b\u00e1n k\u00ednh r = 7.\u00a0\u00a0<\/em><\/p>\n<ul>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\"><em>Di\u1ec7n t\u00edch h\u00ecnh ch\u1eef nh\u1eadt: S1 = 10 x 7 x 2 = 140 cm2<\/em><\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\"><em>Di\u1ec7n t\u00edch hai n\u1eeda h\u00ecnh tr\u00f2n c\u00f9ng b\u00e1n k\u00ednh: S2 = \u03c0R2 = 3,14.72 = 153,86 cm2<\/em><\/p>\n<\/li>\n<\/ul>\n<p dir=\"ltr\"><em>=&gt; Di\u1ec7n t\u00edch to\u00e0n b\u1ed9 h\u00ecnh: S = S2 + S1 = 140 + 153,86 = 293,86 cm2<\/em><\/p>\n<h3 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Dang_4_Bai_toan_tinh_S_tu_d_nang_cao\"><\/span>D\u1ea1ng 4: B\u00e0i to\u00e1n t\u00ednh S t\u1eeb d n\u00e2ng cao<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p dir=\"ltr\">\u0110\u00e2y c\u0169ng l\u00e0 d\u1ea1ng b\u00e0i t\u1eadp to\u00e1n h\u00ecnh tr\u00f2n n\u00e2ng cao, t\u00f9y thu\u1ed9c v\u00e0o d\u1eef ki\u1ec7n \u0111\u00e3 cho \u0111\u1ec3 t\u00ecm \u0111\u01b0\u1ee3c b\u00e1n k\u00ednh ho\u1eb7c \u0111\u01b0\u1eddng k\u00ednh r\u1ed3i m\u1edbi t\u00ednh \u0111\u01b0\u1ee3c S.<\/p>\n<p dir=\"ltr\"><em>V\u00ed d\u1ee5: T\u00ednh S h\u00ecnh tr\u00f2n, bi\u1ebft n\u1ebfu t\u0103ng \u0111\u01b0\u1eddng k\u00ednh \u0111\u01b0\u1eddng tr\u00f2n l\u00ean 30% th\u00ec di\u1ec7n t\u00edch c\u1ee7a h\u00ecnh tr\u00f2n t\u0103ng th\u00eam 20 cm2<\/em><\/p>\n<p dir=\"ltr\"><em>Gi\u1ea3i: N\u1ebfu t\u0103ng \u0111\u01b0\u1eddng k\u00ednh c\u1ee7a h\u00ecnh tr\u00f2n l\u00ean 30% th\u00ec b\u00e1n k\u00ednh c\u0169ng t\u0103ng 30%<\/em><\/p>\n<p dir=\"ltr\"><em>S\u1ed1 % di\u1ec7n t\u00edch \u0111\u01b0\u1ee3c t\u0103ng th\u00eam l\u00e0:<\/em><\/p>\n<p dir=\"ltr\"><em>(130%)2 \u2013 (100%)2 = 69%<\/em><\/p>\n<p dir=\"ltr\"><em>V\u1eady di\u1ec7n t\u00edch h\u00ecnh tr\u00f2n ban \u0111\u1ea7u l\u00e0: 20\u00d7100\/69 = 29,956 cm2<\/em><\/p>\n<p dir=\"ltr\">\n<h2 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Bai_tap_ve_tinh_dien_tich_cua_hinh_tron_de_be_tu_luyen\"><\/span>B\u00e0i t\u1eadp v\u1ec1 t\u00ednh di\u1ec7n t\u00edch c\u1ee7a h\u00ecnh tr\u00f2n \u0111\u1ec3 b\u00e9 t\u1ef1 luy\u1ec7n<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p dir=\"ltr\">Sau khi \u0111\u00e3 n\u1eafm v\u1eefng \u0111\u01b0\u1ee3c nh\u1eefng ki\u1ebfn th\u1ee9c l\u00fd thuy\u1ebft v\u1ec1 c\u00f4ng th\u1ee9c, c\u00e1c d\u1ea1ng b\u00e0i t\u1eadp th\u00ec d\u01b0\u1edbi \u0111\u00e2y Shining Home &#8211; Gia \u0111\u00ecnh Anh Ng\u1eef s\u1ebd t\u1ed5ng h\u1ee3p m\u1ed9t s\u1ed1 b\u00e0i t\u1eadp th\u01b0\u1eddng g\u1eb7p trong c\u00e1c \u0111\u1ec1 thi \u0111\u1ec3 c\u00e1c em c\u00f9ng nhau luy\u1ec7n t\u1eadp nh\u00e9.<\/p>\n<p dir=\"ltr\">B\u00e0i t\u1eadp tr\u1eafc nghi\u1ec7m<\/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-tron-5.jpg\" alt=\"(Ngu\u1ed3n: T\u1ed5ng h\u1ee3p)\" width=\"100%\"><\/p>\n<p dir=\"ltr\">B\u00e0i t\u1eadp t\u1ef1 lu\u1eadn<\/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-tron-6.jpg\" alt=\"(Ngu\u1ed3n: T\u1ed5ng h\u1ee3p)\" width=\"100%\"><\/p>\n<h2 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Meo_giup_be_lam_bai_tap_tinh_dien_tich_hinh_tron_hieu_qua\"><\/span>M\u1eb9o gi\u00fap b\u00e9 l\u00e0m b\u00e0i t\u1eadp t\u00ednh di\u1ec7n t\u00edch h\u00ecnh tr\u00f2n hi\u1ec7u qu\u1ea3<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p dir=\"ltr\">\u0110\u1ed1i v\u1edbi ki\u1ebfn th\u1ee9c v\u1ec1 h\u00ecnh tr\u00f2n, nh\u1ea5t l\u00e0 d\u1ea1ng b\u00e0i t\u1eadp v\u1ec1 t\u00ednh di\u1ec7n t\u00edch s\u1ebd c\u00f3 ch\u00fat ph\u1ee9c t\u1ea1p. V\u1eady n\u00ean, \u0111\u1ec3 gi\u00fap b\u00e9 c\u00f3 th\u1ec3 h\u1ecdc v\u00e0 n\u1eafm ch\u1eafc ki\u1ebfn th\u1ee9c n\u00e0y, b\u1ed1 m\u1eb9 c\u00f3 th\u1ec3 \u00e1p d\u1ee5ng nh\u1eefng b\u00ed quy\u1ebft sau:<\/p>\n<h3 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Trang_bi_nen_tang_toan_hoc_vung_chac_cho_be_cung_Shining_Home_%E2%80%93_Gia_dinh_Anh_Ngu_Math\"><\/span>Trang b\u1ecb 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\">\u0110\u1ed1i v\u1edbi nh\u1eefng b\u00e9 ch\u01b0a c\u00f3 ni\u1ec1m \u0111am m\u00ea v\u1edbi to\u00e1n h\u1ecdc, b\u1ed1 m\u1eb9 kh\u00f4ng c\u00f3 nhi\u1ec1u th\u1eddi gian \u0111\u1ec3 h\u1ed7 tr\u1ee3 b\u00e9 th\u00ec h\u00e3y th\u1eed ch\u1ecdn Shining Home &#8211; Gia \u0111\u00ecnh Anh Ng\u1eef Math \u0111\u1ec3 \u0111\u1ed3ng h\u00e0nh v\u1edbi b\u00e9. \u0110\u01b0\u1ee3c bi\u1ebft, \u0111\u00e2y l\u00e0 \u1ee9ng d\u1ee5ng h\u1ecdc to\u00e1n ti\u1ebfng Anh h\u00e0ng \u0111\u1ea7u t\u1ea1i Vi\u1ec7t Nam, \u0111\u01b0\u1ee3c nhi\u1ec1u ph\u1ee5 huynh kh\u00f4ng ch\u1ec9 t\u1ea1i Vi\u1ec7t Nam v\u00e0 nhi\u1ec1u qu\u1ed1c gia kh\u00e1c l\u1ef1a ch\u1ecdn nh\u1eb1m trang b\u1ecb ki\u1ebfn th\u1ee9c to\u00e1n h\u1ecdc, gia t\u0103ng c\u1ea3m h\u1ee9ng y\u00eau th\u00edch h\u01a1n cho tr\u1ebb.<\/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-tron-7.jpg\" alt=\"K\u1ebft h\u1ee3p h\u1ecdc to\u00e1n v\u1edbi th\u1ef1c h\u00e0nh nhi\u1ec1u h\u01a1n c\u00f9ng Shining Home - Gia \u0111\u00ecnh Anh Ng\u1eef Math. (\u1ea2nh: Shining Home - Gia \u0111\u00ecnh Anh Ng\u1eef)\" width=\"100%\"><\/p>\n<p dir=\"ltr\">C\u1ee5 th\u1ec3, Shining Home &#8211; Gia \u0111\u00ecnh Anh Ng\u1eef Math cung c\u1ea5p n\u1ed9i dung to\u00e1n h\u1ecdc b\u00e1m s\u00e1t ch\u01b0\u01a1ng tr\u00ecnh GDPT m\u1edbi nh\u1ea5t \u0111\u01b0a ra, nh\u1eb1m th\u00fac \u0111\u1ea9y b\u00e9 ph\u00e1t tri\u1ec3n n\u0103ng l\u1ef1c to\u00e1n h\u1ecdc h\u01a1n, t\u00edch c\u1ef1c t\u00ecm hi\u1ec3u, t\u01b0 duy v\u00e0 n\u1eafm \u0111\u01b0\u1ee3c g\u1ed1c r\u1ec5 b\u00e0i to\u00e1n h\u01a1n.<\/p>\n<p dir=\"ltr\">\u0110\u1eb7c bi\u1ec7t, to\u00e0n b\u1ed9 ch\u01b0\u01a1ng tr\u00ecnh h\u1ecdc t\u1ea1i Shining Home &#8211; Gia \u0111\u00ecnh Anh Ng\u1eef Math c\u00f2n d\u1ef1a tr\u00ean ti\u00eau chu\u1ea9n Common Core State Standards c\u1ee7a M\u1ef9, v\u1edbi h\u01a1n 60 ch\u1ee7 \u0111\u1ec1 to\u00e1n h\u1ecdc, d\u1ef1a tr\u00ean 7 chuy\u00ean \u0111\u1ec1 ch\u00ednh bao g\u1ed3m:<\/p>\n<ul>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">\u0110\u1ebfm &amp; T\u1eadp h\u1ee3p s\u1ed1<\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">Ph\u00e9p t\u00ednh &amp; T\u01b0 duy \u0111\u1ea1i s\u1ed1<\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">S\u1ed1 &amp; Ph\u00e9p t\u00ednh h\u1ec7 Th\u1eadp ph\u00e2n<\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">\u0110o l\u01b0\u1eddng<\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">H\u00ecnh h\u1ecdc<\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">Kh\u00f4ng gian &amp; Th\u1eddi gian<\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">D\u1eef li\u1ec7u &amp; \u0110\u1ed3 th\u1ecb<\/p>\n<\/li>\n<\/ul>\n<p dir=\"ltr\">Trong \u0111\u00f3, t\u1ea5t c\u1ea3 s\u1ebd chia th\u00e0nh 4 c\u1ea5p \u0111\u1ed9 h\u1ecdc t\u1eeb d\u1ec5 \u0111\u1ebfn n\u00e2ng cao ph\u00f9 h\u1ee3p v\u1edbi nhi\u1ec1u l\u1ee9a tu\u1ed5i &amp; tr\u00ecnh \u0111\u1ed9 c\u1ee7a tr\u1ebb. N\u00ean b\u1ed1 m\u1eb9 ho\u00e0n to\u00e0n d\u1ec5 d\u00e0ng l\u1ef1a ch\u1ecdn \u0111\u01b0\u1ee3c c\u1ea5p \u0111\u1ed9 h\u1ecdc ph\u00f9 h\u1ee3p nh\u1ea5t v\u1edbi b\u00e9 y\u00eau c\u1ee7a m\u00ecnh.<\/p>\n<p dir=\"ltr\">\u0110\u1eb7c bi\u1ec7t, h\u1ec7 th\u1ed1ng b\u00e0i h\u1ecdc trong Shining Home &#8211; Gia \u0111\u00ecnh Anh Ng\u1eef Math \u0111\u1ec1u \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf logic, ch\u1eb7t ch\u1ebd v\u1edbi ho\u1ea1t \u0111\u1ed9ng h\u1ecdc t\u1eadp v\u00e0 \u00f4n t\u1eadp ki\u1ebfn th\u1ee9c. \u0110\u1ec3 qua \u0111\u00f3 gi\u00fap b\u00e9 d\u1ec5 d\u00e0ng l\u0129nh h\u1ed9i, ti\u1ebfp thu ch\u00fang m\u1ed9t c\u00e1ch hi\u1ec7u qu\u1ea3 h\u01a1n.<\/p>\n<p dir=\"ltr\">Thay v\u00ec nh\u1eefng b\u00e0i h\u1ecdc kh\u00f4 khan tr\u00ean s\u00e1ch v\u1edf, khi h\u1ecdc c\u00f9ng Shining Home &#8211; Gia \u0111\u00ecnh Anh Ng\u1eef Math, b\u00e9 s\u1ebd \u0111\u01b0\u1ee3c tr\u1ea3i nghi\u1ec7m v\u00e0 kh\u00e1m ph\u00e1 nhi\u1ec1u ho\u1ea1t \u0111\u1ed9ng th\u00f4ng qua c\u00e1c tr\u00f2 ch\u01a1i t\u01b0\u01a1ng t\u00e1c, xem video b\u00e0i gi\u1ea3ng, gi\u1ea3i c\u00e2u \u0111\u1ed1, l\u00e0m b\u00e0i t\u1eadp,\u2026 v\u1edbi h\u00ecnh \u1ea3nh minh h\u1ecda ng\u1ed9 ngh\u0129nh, \u00e2m thanh s\u1ed1ng \u0111\u1ed9ng \u0111\u1ec3 cung c\u1ea5p ki\u1ebfn th\u1ee9c m\u1ed9t c\u00e1ch tr\u1ef1c quan v\u00e0 gi\u00fap tr\u1ebb ti\u1ebfp thu ki\u1ebfn th\u1ee9c m\u1ed9t c\u00e1ch h\u1ee9ng th\u00fa v\u00e0 t\u1ef1 nhi\u00ean nh\u1ea5t.<\/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<h3 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Nam_chac_kien_thuc_lien_quan_toi_tinh_dien_tich_hinh_tron\"><\/span>N\u1eafm ch\u1eafc ki\u1ebfn th\u1ee9c li\u00ean quan t\u1edbi t\u00ednh di\u1ec7n t\u00edch h\u00ecnh tr\u00f2n<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p dir=\"ltr\">Khi h\u1ecdc t\u1edbi ki\u1ebfn th\u1ee9c n\u00e0o, \u0111\u00f2i h\u1ecfi c\u00e1c em c\u1ea7n ph\u1ea3i n\u1eafm ch\u1eafc ph\u1ea7n \u0111\u00f3. Khi h\u1ecdc t\u1edbi ph\u1ea7n di\u1ec7n t\u00edch c\u1ee7a h\u00ecnh tr\u00f2n, b\u1ed1 m\u1eb9 c\u1ea7n ph\u1ea3i ki\u1ec3m tra xem b\u00e9 \u0111\u00e3 n\u1eafm v\u1eefng \u0111\u01b0\u1ee3c c\u00e1c ki\u1ebfn th\u1ee9c li\u00ean quan nh\u01b0 b\u00e1n k\u00ednh, \u0111\u01b0\u1eddng k\u00ednh, chu vi h\u00ecnh tr\u00f2n, c\u00f4ng th\u1ee9c t\u00ednh,\u2026<\/p>\n<p dir=\"ltr\">B\u1edfi v\u00ec ch\u1ec9 khi n\u1eafm \u0111\u01b0\u1ee3c h\u1ebft nh\u1eefng d\u1eef ki\u1ec7n n\u00e0y b\u00e9 m\u1edbi c\u00f3 th\u1ec3 chinh ph\u1ee5c d\u1ea1ng to\u00e1n t\u00ednh di\u1ec7n t\u00edch c\u1ee7a h\u00ecnh tr\u00f2n m\u1ed9t c\u00e1ch ch\u00ednh x\u00e1c.<\/p>\n<h3 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Cung_be_thuc_hanh_luyen_tap_thuong_xuyen\"><\/span>C\u00f9ng b\u00e9 th\u1ef1c h\u00e0nh, luy\u1ec7n t\u1eadp th\u01b0\u1eddng xuy\u00ean<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p dir=\"ltr\">\u0110\u1ec3 tr\u00e1nh t\u00ecnh tr\u1ea1ng b\u00e9 \u201ch\u1ecdc tr\u01b0\u1edbc qu\u00ean sau\u201d, b\u1ed1 m\u1eb9 n\u00ean c\u00f9ng b\u00e9 th\u1ef1c h\u00e0nh th\u01b0\u1eddng xuy\u00ean. Vi\u1ec7c th\u1ef1c h\u00e0nh \u1edf \u0111\u00e2y c\u00f3 th\u1ec3 \u0111\u1ebfn t\u1eeb vi\u1ec7c c\u00f9ng con l\u00e0m b\u00e0i t\u1eadp trong SGK, t\u00ecm hi\u1ec3u nhi\u1ec1u ki\u1ebfn th\u1ee9c tr\u00ean internet \u0111\u1ec3 n\u00e2ng cao k\u1ef9 n\u0103ng, t\u1ed5 ch\u1ee9c c\u00e1c cu\u1ed9c thi nho nh\u1ecf, h\u1ecdc th\u00f4ng qua tr\u00f2 ch\u01a1i,\u2026<\/p>\n<p dir=\"ltr\">Khi \u0111\u01b0\u1ee3c th\u1ef1c h\u00e0nh, luy\u1ec7n t\u1eadp th\u01b0\u1eddng xuy\u00ean s\u1ebd gi\u00fap b\u00e9 ghi nh\u1edb t\u1ed1t h\u01a1n, c\u0169ng nh\u01b0 c\u00f3 s\u1ef1 h\u1ee9ng th\u00fa trong qu\u00e1 tr\u00ecnh h\u1ecdc t\u1eadp.<\/p>\n<p dir=\"ltr\">Xem th\u00eam:<\/p>\n<ol>\n<li dir=\"ltr\">Shining Home &#8211; Gia \u0111\u00ecnh Anh Ng\u1eef Math &#8211; \u1ee8ng d\u1ee5ng h\u1ecdc to\u00e1n b\u1eb1ng ti\u1ebfng Anh s\u1ed1 1 cho tr\u1ebb m\u1ea7m non &amp; ti\u1ec3u h\u1ecdc<\/li>\n<li dir=\"ltr\">C\u00e1ch t\u00ednh b\u00e1n k\u00ednh h\u00ecnh tr\u00f2n \u0111\u01a1n gi\u1ea3n v\u00e0 b\u00e0i t\u1eadp t\u1ef1 luy\u1ec7n hi\u1ec7u qu\u1ea3<\/li>\n<li dir=\"ltr\">C\u00e1ch t\u00ednh \u0111\u01b0\u1eddng k\u00ednh h\u00ecnh tr\u00f2n \u0111\u01a1n gi\u1ea3n ch\u1ec9 v\u1edbi 3 c\u00f4ng th\u1ee9c<\/li>\n<\/ol>\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-tron-8.jpg\" alt=\"C\u00f9ng b\u00e9 luy\u1ec7n t\u1eadp th\u01b0\u1eddng xuy\u00ean r\u1ea5t quan tr\u1ecdng. (\u1ea2nh: S\u01b0u t\u1ea7m internet)\" width=\"100%\"><\/p>\n<h3 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Ghi_nho_cong_thuc_hinh_tron_qua_bai_tho\"><\/span>Ghi nh\u1edb c\u00f4ng th\u1ee9c h\u00ecnh tr\u00f2n qua b\u00e0i th\u01a1<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p dir=\"ltr\">D\u01b0\u1edbi \u0111\u00e2y l\u00e0 b\u00e0i \u201cth\u01a1 ch\u1ebf\u201d v\u1ec1 c\u00e1c c\u00f4ng th\u1ee9c trong h\u00ecnh tr\u00f2n \u0111\u1ec3 b\u00e9 c\u00f3 th\u1ec3 h\u1ecdc v\u00e0 ghi nh\u1edb d\u1ec5 d\u00e0ng h\u01a1n:<\/p>\n<p dir=\"ltr\" style=\"text-align: center\"><em>H\u00ecnh tr\u00f2n di\u1ec7n t\u00edch \u0111\u01a1n gi\u1ea3n<\/em><\/p>\n<p dir=\"ltr\" style=\"text-align: center\"><em>B\u00ecnh ph\u01b0\u01a1ng b\u00e1n k\u00ednh ta nh\u00e2n ngay v\u00e0o<\/em><\/p>\n<p dir=\"ltr\" style=\"text-align: center\"><em>Ba ph\u1ea9y m\u01b0\u1eddi b\u1ed1n ph\u00eda sau<\/em><\/p>\n<p dir=\"ltr\" style=\"text-align: center\"><em>Chu vi c\u0169ng d\u1ec5 t\u00ednh mau b\u1ea1n \u00e0<\/em><\/p>\n<p dir=\"ltr\" style=\"text-align: center\"><em>\u0110\u01b0\u1eddng k\u00ednh ta l\u1ea5y nh\u00e2n ra<\/em><\/p>\n<p dir=\"ltr\" style=\"text-align: center\"><em>Ba ph\u1ea9y m\u01b0\u1eddi b\u1ed1n, th\u1ebf l\u00e0 \u0111\u00e3 xong.<\/em><\/p>\n<p dir=\"ltr\" style=\"text-align: center\"><em>&#8211; S\u01b0u T\u1ea7m \u2013<\/em><\/p>\n<h2 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Ket_luan\"><\/span>K\u1ebft lu\u1eadn<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<\/p>\n<p dir=\"ltr\">Tr\u00ean \u0111\u00e2y l\u00e0 nh\u1eefng th\u00f4ng tin v\u1ec1 ki\u1ebfn th\u1ee9c di\u1ec7n t\u00edch h\u00ecnh tr\u00f2n. M\u1eb7c d\u00f9 \u0111\u00e2y ch\u1ec9 l\u00e0 nh\u1eefng ki\u1ebfn th\u1ee9c c\u01a1 b\u1ea3n, nh\u01b0ng n\u00f3 l\u00e0 h\u00e0nh trang \u0111\u1ec3 c\u00e1c em gi\u1ea3i \u0111\u01b0\u1ee3c c\u00e1c b\u00e0i t\u1eadp n\u00e2ng cao, n\u00ean h\u00e3y n\u1eafm b\u1eaft k\u1ef9, c\u0169ng nh\u01b0 \u0111\u1eebng b\u1ecf qua nh\u1eefng b\u00ed quy\u1ebft m\u00e0 Shining Home &#8211; Gia \u0111\u00ecnh Anh Ng\u1eef g\u1ee3i \u00fd \u0111\u1ec3 \u0111\u1ec3 gi\u00fap qu\u00e1 tr\u00ecnh h\u1ecdc t\u1eadp hi\u1ec7u qu\u1ea3 h\u01a1n nh\u00e9.<\/p>\n<p>                                    \u00a0\u00a0T\u00e0i li\u1ec7u tham kh\u1ea3o<\/p>\n<p>Area of a Circle Calculator<\/p>\n<p>https:\/\/www.omnicalculator.com\/math\/area-of-a-circle<\/p>\n<p>Area of a Circle Calculator<\/p>\n<p>https:\/\/www.mathsisfun.com\/geometry\/circle-area.html<\/p>\n<p>Ngu\u1ed3n: <a href=\"https:\/\/www.ckconitsha.com\/vn\/\">https:\/\/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>V\u1edbi vi\u1ec7c \u00e1p d\u1ee5ng c\u00f4ng th\u1ee9c c\u00f3 s\u1eb5n, vi\u1ec7c t\u00ednh di\u1ec7n t\u00edch h\u00ecnh tr\u00f2n s\u1ebd \u0111\u01a1n gi\u1ea3n v\u00e0 d\u1ec5 d\u00e0ng h\u01a1n. V\u1eady n\u00ean, \u0111\u1ec3 bi\u1ebft c\u00f4ng th\u1ee9c v\u00e0 c\u00e1ch gi\u1ea3i b\u00e0i t\u1eadp v\u1ec1 t\u00ednh di\u1ec7n t\u00edch c\u1ee7a h\u00ecnh tr\u00f2n, h\u00e3y c\u00f9ng Shining Home &#8211; Gia \u0111\u00ecnh Anh Ng\u1eef t\u00ecm hi\u1ec3u v\u00e0 gi\u1ea3i \u0111\u00e1p chi ti\u1ebft&#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-13765","post","type-post","status-publish","format-standard","hentry","category-kien-thuc"],"_links":{"self":[{"href":"https:\/\/www.ckconitsha.com\/vn\/wp-json\/wp\/v2\/posts\/13765","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=13765"}],"version-history":[{"count":2,"href":"https:\/\/www.ckconitsha.com\/vn\/wp-json\/wp\/v2\/posts\/13765\/revisions"}],"predecessor-version":[{"id":16991,"href":"https:\/\/www.ckconitsha.com\/vn\/wp-json\/wp\/v2\/posts\/13765\/revisions\/16991"}],"wp:attachment":[{"href":"https:\/\/www.ckconitsha.com\/vn\/wp-json\/wp\/v2\/media?parent=13765"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ckconitsha.com\/vn\/wp-json\/wp\/v2\/categories?post=13765"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ckconitsha.com\/vn\/wp-json\/wp\/v2\/tags?post=13765"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}