{"id":14246,"date":"2025-06-07T10:09:11","date_gmt":"2025-06-07T03:09:11","guid":{"rendered":"https:\/\/www.ckconitsha.com\/vn\/?p=14246"},"modified":"2025-07-04T10:30:10","modified_gmt":"2025-07-04T03:30:10","slug":"hinh-thang-la-gi-tinh-chat-dau-hieu-nhan-biet-hinh-thang","status":"publish","type":"post","link":"https:\/\/www.ckconitsha.com\/vn\/hinh-thang-la-gi-tinh-chat-dau-hieu-nhan-biet-hinh-thang\/","title":{"rendered":"H\u00ecnh thang l\u00e0 g\u00ec? T\u00ednh ch\u1ea5t, d\u1ea5u hi\u1ec7u nh\u1eadn bi\u1ebft h\u00ecnh thang"},"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\/hinh-thang-la-gi-tinh-chat-dau-hieu-nhan-biet-hinh-thang\/#Trapezoid_la_gi\" >Trapezoid 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-2\" href=\"https:\/\/www.ckconitsha.com\/vn\/hinh-thang-la-gi-tinh-chat-dau-hieu-nhan-biet-hinh-thang\/#Cac_thuoc_tinh_cua_hinh_thang\" >C\u00e1c thu\u1ed9c t\u00ednh c\u1ee7a h\u00ecnh thang<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.ckconitsha.com\/vn\/hinh-thang-la-gi-tinh-chat-dau-hieu-nhan-biet-hinh-thang\/#Cac_dang_hinh_thang_dac_biet\" >C\u00e1c d\u1ea1ng h\u00ecnh thang \u0111\u1eb7c bi\u1ec7t<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.ckconitsha.com\/vn\/hinh-thang-la-gi-tinh-chat-dau-hieu-nhan-biet-hinh-thang\/#Cong_thuc_cho_chu_vi_khu_vuc_hinh_thang\" >C\u00f4ng th\u1ee9c cho chu vi, khu v\u1ef1c h\u00ecnh thang<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.ckconitsha.com\/vn\/hinh-thang-la-gi-tinh-chat-dau-hieu-nhan-biet-hinh-thang\/#Cong_thuc_tinh_toan_chu_vi_cua_hinh_thang\" >C\u00f4ng th\u1ee9c t\u00ednh to\u00e1n chu vi c\u1ee7a h\u00ecnh thang<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.ckconitsha.com\/vn\/hinh-thang-la-gi-tinh-chat-dau-hieu-nhan-biet-hinh-thang\/#Cong_thuc_tinh_toan_dien_tich_hinh_thang\" >C\u00f4ng th\u1ee9c t\u00ednh to\u00e1n di\u1ec7n t\u00edch h\u00ecnh thang<\/a><\/li><\/ul><\/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\/hinh-thang-la-gi-tinh-chat-dau-hieu-nhan-biet-hinh-thang\/#Mot_so_loai_bai_tap_hinh_thang_pho_bien\" >M\u1ed9t s\u1ed1 lo\u1ea1i b\u00e0i t\u1eadp h\u00ecnh thang ph\u1ed5 bi\u1ebfn<\/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\/hinh-thang-la-gi-tinh-chat-dau-hieu-nhan-biet-hinh-thang\/#Mau_1_Tinh_toan_do_goc\" >M\u1eabu 1: T\u00ednh to\u00e1n \u0111o g\u00f3c<\/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\/hinh-thang-la-gi-tinh-chat-dau-hieu-nhan-biet-hinh-thang\/#Mau_2_Chung_minh_rang_hinh_da_la_hinh_thang_hinh_thanghinh_thanghinh_thang\" >M\u1eabu 2: Ch\u1ee9ng minh r\u1eb1ng h\u00ecnh \u0111\u00e3 l\u00e0 h\u00ecnh thang h\u00ecnh thang\/h\u00ecnh thang\/h\u00ecnh thang<\/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\/hinh-thang-la-gi-tinh-chat-dau-hieu-nhan-biet-hinh-thang\/#Mau_3_Ap_dung_cac_thuoc_tinh_de_chung_minh_cac_yeu_cau_cua_van_de\" >M\u1eabu 3: \u00c1p d\u1ee5ng c\u00e1c thu\u1ed9c t\u00ednh \u0111\u1ec3 ch\u1ee9ng minh c\u00e1c y\u00eau c\u1ea7u c\u1ee7a v\u1ea5n \u0111\u1ec1<\/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\/hinh-thang-la-gi-tinh-chat-dau-hieu-nhan-biet-hinh-thang\/#Mau_4_Tinh_chu_vi_dien_tich_cua_hinh_thang\" >M\u1eabu 4: T\u00ednh chu vi, di\u1ec7n t\u00edch c\u1ee7a h\u00ecnh thang<\/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\/hinh-thang-la-gi-tinh-chat-dau-hieu-nhan-biet-hinh-thang\/#Huong_dan_giai_cac_bai_tap_hinh_thang_o_trang_9192_Sach_giao_khoa_cua_Lop_5\" >H\u01b0\u1edbng d\u1eabn gi\u1ea3i c\u00e1c b\u00e0i t\u1eadp h\u00ecnh thang \u1edf trang 91.92 S\u00e1ch gi\u00e1o khoa c\u1ee7a L\u1edbp 5<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/www.ckconitsha.com\/vn\/hinh-thang-la-gi-tinh-chat-dau-hieu-nhan-biet-hinh-thang\/#Bai_1_Trang_91_SGK_Lop_5\" >B\u00e0i 1 Trang 91 SGK L\u1edbp 5<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/www.ckconitsha.com\/vn\/hinh-thang-la-gi-tinh-chat-dau-hieu-nhan-biet-hinh-thang\/#Bai_2_Trang_91_SGK_Lop_5\" >B\u00e0i 2 Trang 91 SGK L\u1edbp 5<\/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\/hinh-thang-la-gi-tinh-chat-dau-hieu-nhan-biet-hinh-thang\/#Bai_3_Trang_92_SGK_Lop_5\" >B\u00e0i 3 Trang 92 SGK L\u1edbp 5<\/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\/hinh-thang-la-gi-tinh-chat-dau-hieu-nhan-biet-hinh-thang\/#Bai_4_Trang_92_SGK_Lop_5\" >B\u00e0i 4 Trang 92 SGK L\u1edbp 5<\/a><\/li><\/ul><\/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\/hinh-thang-la-gi-tinh-chat-dau-hieu-nhan-biet-hinh-thang\/#Cach_huong_dan_tre_hoc_va_thuc_hien_cac_bai_tap_hinh_thang_mot_cach_hieu_qua\" >C\u00e1ch h\u01b0\u1edbng d\u1eabn tr\u1ebb h\u1ecdc v\u00e0 th\u1ef1c hi\u1ec7n c\u00e1c b\u00e0i t\u1eadp h\u00ecnh thang m\u1ed9t c\u00e1ch hi\u1ec7u qu\u1ea3<\/a><\/li><\/ul><\/nav><\/div>\n<\/p>\n<p>Trapezoid l\u00e0 m\u1ed9t trong nh\u1eefng kh\u00e1i ni\u1ec7m c\u01a1 b\u1ea3n trong h\u00ecnh h\u1ecdc c\u1ee7a to\u00e1n h\u1ecdc v\u00e0 th\u01b0\u1eddng g\u1eb7p trong ch\u01b0\u01a1ng tr\u00ecnh gi\u00e1o d\u1ee5c. Trong b\u00e0i vi\u1ebft n\u00e0y, ch\u00fang ta s\u1ebd t\u00ecm hi\u1ec3u t\u1ea5t c\u1ea3 ki\u1ebfn \u200b\u200bth\u1ee9c v\u1ec1 h\u00ecnh thang t\u1eeb kh\u00e1i ni\u1ec7m \u0111\u1ebfn c\u00e1c thu\u1ed9c t\u00ednh \u0111\u1eb7c tr\u01b0ng v\u00e0 d\u1ea5u hi\u1ec7u nh\u1eadn d\u1ea1ng h\u00ecnh thang. H\u00e3y c\u00f9ng nhau kh\u00e1m ph\u00e1!<\/p>\n<p>                        Xem t\u1ea5t c\u1ea3<\/p>\n<h2 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Trapezoid_la_gi\"><\/span>Trapezoid l\u00e0 g\u00ec?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p dir=\"ltr\">H\u00ecnh thang l\u00e0 m\u1ed9t lo\u1ea1i h\u00ecnh t\u1ee9 gi\u00e1c v\u1edbi hai m\u1eb7t \u0111\u1ed1i di\u1ec7n c\u1ee7a n\u00f3 song song v\u1edbi nhau. Hai c\u1ea1nh n\u00e0y \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 \u0111\u00e1y c\u1ee7a h\u00ecnh thang, v\u00e0 hai c\u1ea1nh c\u00f2n l\u1ea1i \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 hai c\u1ea1nh. <em>(Xem h\u00ecnh minh h\u1ecda)<\/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\/1-hinh-thang.png\" alt=\"H\u00ecnh thang. (\u1ea2nh: B\u1ed9 s\u01b0u t\u1eadp Internet)\" width=\"100%\"><\/p>\n<h2 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Cac_thuoc_tinh_cua_hinh_thang\"><\/span>C\u00e1c thu\u1ed9c t\u00ednh c\u1ee7a h\u00ecnh thang<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p dir=\"ltr\">D\u01b0\u1edbi \u0111\u00e2y l\u00e0 c\u00e1c thu\u1ed9c t\u00ednh c\u01a1 b\u1ea3n c\u1ee7a h\u00ecnh thang:<\/p>\n<p dir=\"ltr\">1. Thu\u1ed9c t\u00ednh g\u00f3c:<\/p>\n<ul>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">Hai g\u00f3c c\u1ee7a m\u1ed9t b\u00ean c\u1ee7a h\u00ecnh thang c\u00f3 t\u1ed5ng c\u1ed9ng 180 \u0111\u1ed9. \u0110i\u1ec1u n\u00e0y c\u00f3 ngh\u0129a l\u00e0 hai g\u00f3c \u0111\u01b0\u1ee3c \u0111\u1eb7t \u1edf v\u1ecb tr\u00ed b\u00ean trong c\u1ee7a hai ph\u00e2n \u0111o\u1ea1n song song l\u00e0 hai ph\u00eda d\u01b0\u1edbi c\u00f9ng.<\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">Trong h\u00ecnh thang, hai g\u00f3c b\u1eb1ng nhau.<\/p>\n<\/li>\n<\/ul>\n<p dir=\"ltr\">2. C\u00e1c thu\u1ed9c t\u00ednh c\u1ee7a c\u1ea1nh:<\/p>\n<ul>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">N\u1ebfu m\u1ed9t h\u00ecnh thang c\u00f3 hai c\u1ea1nh b\u1eb1ng nhau, th\u00ec hai c\u1ea1nh l\u00e0 song song v\u00e0 b\u1eb1ng nhau.<\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">N\u1ebfu h\u00ecnh thang c\u00f3 hai c\u1ea1nh song song, th\u00ec ch\u00fang b\u1eb1ng nhau v\u00e0 hai b\u00ean b\u1eb1ng nhau.<\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">Trong h\u00ecnh thang, hai \u0111\u01b0\u1eddng ch\u00e9o b\u1eb1ng nhau.<\/p>\n<\/li>\n<\/ul>\n<p dir=\"ltr\">3. \u0110\u01b0\u1eddng trung b\u00ecnh:<\/p>\n<ul>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">\u0110\u01b0\u1eddng trung b\u00ecnh l\u00e0 \u0111i\u1ec3m gi\u1eefa c\u1ee7a hai c\u1ea1nh c\u1ee7a h\u00ecnh thang.<\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">D\u00f2ng trung b\u00ecnh c\u1ee7a h\u00ecnh thang b\u1eb1ng t\u1ed5ng chi\u1ec1u d\u00e0i c\u1ee7a \u0111\u00e1y.<\/p>\n<\/li>\n<\/ul>\n<h2 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Cac_dang_hinh_thang_dac_biet\"><\/span>C\u00e1c d\u1ea1ng h\u00ecnh thang \u0111\u1eb7c bi\u1ec7t<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p dir=\"ltr\">C\u00f3 m\u1ed9t s\u1ed1 h\u00ecnh th\u1ee9c \u0111\u1eb7c bi\u1ec7t c\u1ee7a h\u00ecnh thang m\u00e0 b\u1ea1n c\u1ea7n ghi nh\u1edb. C\u1ee5 th\u1ec3 nh\u01b0 sau:<\/p>\n<p dir=\"ltr\">1. H\u00ecnh thang vu\u00f4ng: \u0110\u00e2y l\u00e0 m\u1ed9t h\u00ecnh thang v\u1edbi m\u1ed9t g\u00f3c vu\u00f4ng, IE m\u1ed9t trong b\u1ed1n g\u00f3c c\u1ee7a n\u00f3 \u0111\u1ec3 \u0111o 90 \u0111\u1ed9.<\/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\/2-hinh-thang.png\" alt=\"H\u00ecnh thang vu\u00f4ng. (\u1ea2nh: B\u1ed9 s\u01b0u t\u1eadp Internet)\" width=\"100%\"><\/p>\n<p dir=\"ltr\">2. Tr\u1ecdng l\u01b0\u1ee3ng h\u00ecnh thang: H\u00ecnh thang n\u00e0y c\u00f3 hai c\u1ea1nh li\u1ec1n k\u1ec1 v\u1edbi m\u1ed9t \u0111\u00e1y b\u1eb1ng nhau. \u0110i\u1ec1u n\u00e0y g\u00e2y ra hai g\u00f3c li\u1ec1n k\u1ec1 v\u1edbi m\u1ed9t \u0111\u00e1y trong m\u1ed9t h\u00ecnh thang c\u00e2n b\u1eb1ng.<\/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\/3-hinh-thang.png\" alt=\"Thang \u0111o h\u00ecnh thang. (\u1ea2nh: B\u1ed9 s\u01b0u t\u1eadp Internet)\" width=\"100%\"><\/p>\n<p dir=\"ltr\">3. Th\u00f4ng tin m\u1ec7nh gi\u00e1: Trong h\u00ecnh thang n\u00e0y, hai b\u00ean b\u1eb1ng nhau v\u00e0 hai b\u00ean c\u0169ng b\u1eb1ng nhau. \u0110i\u1ec1u n\u00e0y l\u00e0m cho h\u00ecnh b\u00ecnh h\u00e0nh c\u00f3 c\u00e1c g\u00f3c \u0111\u1ed1i di\u1ec7n \u0111\u1ed3ng \u0111\u1ec1u v\u00e0 c\u00e1c g\u00f3c li\u1ec1n k\u1ec1 song song.<\/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\/4-hinh-thang.png\" alt=\"H\u00ecnh b\u00ecnh h\u00e0nh. (\u1ea2nh: B\u1ed9 s\u01b0u t\u1eadp Internet)\" width=\"100%\"><\/p>\n<p dir=\"ltr\">4. H\u00ecnh ch\u1eef nh\u1eadt: H\u00ecnh thang n\u00e0y l\u00e0 s\u1ef1 k\u1ebft h\u1ee3p c\u1ee7a h\u00ecnh vu\u00f4ng v\u00e0 h\u00ecnh b\u00ecnh h\u00e0nh. N\u00f3 c\u00f3 m\u1ed9t g\u00f3c vu\u00f4ng v\u00e0 hai c\u1ea1nh b\u1eb1ng nhau, gi\u1ed1ng nh\u01b0 m\u1ed9t h\u00ecnh b\u00ecnh h\u00e0nh. H\u00ecnh ch\u1eef nh\u1eadt l\u00e0 m\u1ed9t tr\u01b0\u1eddng h\u1ee3p \u0111\u1eb7c bi\u1ec7t c\u1ee7a m\u1ed9t h\u00ecnh thang v\u1eeba l\u00e0 h\u00ecnh vu\u00f4ng v\u00e0 c\u00e2n.<\/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\/5-hinh-thang.png\" alt=\"H\u00ecnh ch\u1eef nh\u1eadt. (\u1ea2nh: B\u1ed9 s\u01b0u t\u1eadp Internet)\" width=\"100%\"><\/p>\n<p dir=\"ltr\">N\u1eafm v\u1eefng c\u00e1c h\u00ecnh th\u1ee9c \u0111\u1eb7c bi\u1ec7t n\u00e0y s\u1ebd h\u1ed7 tr\u1ee3 b\u1ea1n gi\u1ea3i quy\u1ebft c\u00e1c b\u00e0i t\u1eadp h\u00ecnh thang m\u1ed9t c\u00e1ch d\u1ec5 d\u00e0ng v\u00e0 ch\u00ednh x\u00e1c.<\/p>\n<h2 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Cong_thuc_cho_chu_vi_khu_vuc_hinh_thang\"><\/span>C\u00f4ng th\u1ee9c cho chu vi, khu v\u1ef1c h\u00ecnh thang<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p dir=\"ltr\">C\u00f4ng th\u1ee9c chu vi v\u00e0 c\u00f4ng th\u1ee9c t\u00ednh to\u00e1n di\u1ec7n t\u00edch h\u00ecnh thang l\u00e0 hai c\u00f4ng th\u1ee9c c\u01a1 b\u1ea3n nh\u1ea5t c\u1ee7a h\u00ecnh thang m\u00e0 b\u1ea1n c\u1ea7n ghi nh\u1edb.<\/p>\n<h3 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Cong_thuc_tinh_toan_chu_vi_cua_hinh_thang\"><\/span>C\u00f4ng th\u1ee9c t\u00ednh to\u00e1n chu vi c\u1ee7a h\u00ecnh thang<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p dir=\"ltr\">\u0110\u1ec3 t\u00ednh chu vi c\u1ee7a h\u00ecnh thang, ch\u00fang ta c\u1ea7n th\u00eam t\u1ed5ng chi\u1ec1u d\u00e0i c\u1ee7a \u0111\u00e1y v\u00e0 hai c\u1ea1nh c\u1ee7a n\u00f3.<\/p>\n<p dir=\"ltr\">\u0110\u1eb7t chu vi h\u00ecnh thang P, v\u00e0 c\u00e1c c\u1ea1nh v\u00e0 \u0111\u00e1y t\u01b0\u01a1ng \u1ee9ng l\u00e0 A, B, C v\u00e0 D. V\u00e0o th\u1eddi \u0111i\u1ec3m \u0111\u00f3, c\u00f4ng th\u1ee9c t\u00ednh to\u00e1n chu vi c\u1ee7a h\u00ecnh thang \u0111\u00e3 \u0111\u01b0\u1ee3c vi\u1ebft l\u1ea1i nh\u01b0 sau:<\/p>\n<p dir=\"ltr\" style=\"text-align: center\">P = A + B + C + D<\/p>\n<h3 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Cong_thuc_tinh_toan_dien_tich_hinh_thang\"><\/span>C\u00f4ng th\u1ee9c t\u00ednh to\u00e1n di\u1ec7n t\u00edch h\u00ecnh thang<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p dir=\"ltr\">\u0110\u1ec3 t\u00ednh di\u1ec7n t\u00edch c\u1ee7a h\u00ecnh thang, ch\u00fang t\u00f4i c\u00f3 hai c\u00f4ng th\u1ee9c \u0111\u01a1n gi\u1ea3n, nh\u01b0 sau:<\/p>\n<p dir=\"ltr\">1. V\u00f9ng h\u00ecnh thang l\u00e0 m\u1ed9t n\u1eeda s\u1ea3n ph\u1ea9m c\u1ee7a t\u1ed5ng c\u1ee7a c\u00e1c c\u1ea1nh d\u01b0\u1edbi c\u00f9ng v\u1edbi chi\u1ec1u cao:<\/p>\n<p dir=\"ltr\" style=\"text-align: center\">S = (a + b) xh \/ 2<\/p>\n<p dir=\"ltr\">Trong \u0111\u00f3:<\/p>\n<ul>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">S l\u00e0 khu v\u1ef1c h\u00ecnh thang.<\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">A v\u00e0 B l\u00e0 chi\u1ec1u d\u00e0i c\u1ee7a \u0111\u00e1y.<\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">H l\u00e0 chi\u1ec1u cao c\u1ee7a h\u00ecnh thang (kho\u1ea3ng c\u00e1ch gi\u1eefa hai \u0111\u00e1y).<\/p>\n<\/li>\n<\/ul>\n<p dir=\"ltr\">2. V\u00f9ng h\u00ecnh thang b\u1eb1ng v\u1edbi s\u1ea3n ph\u1ea9m c\u1ee7a trung b\u00ecnh v\u00e0 chi\u1ec1u cao:<\/p>\n<p dir=\"ltr\" style=\"text-align: center\">S = (a + b) \/ 2 xh<\/p>\n<p dir=\"ltr\">Trong \u0111\u00f3:<\/p>\n<ul>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">S l\u00e0 khu v\u1ef1c h\u00ecnh thang.<\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">A v\u00e0 B l\u00e0 chi\u1ec1u d\u00e0i c\u1ee7a \u0111\u00e1y.<\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">H l\u00e0 chi\u1ec1u cao c\u1ee7a h\u00ecnh thang (kho\u1ea3ng c\u00e1ch gi\u1eefa hai \u0111\u00e1y).<\/p>\n<\/li>\n<\/ul>\n<p dir=\"ltr\"><img decoding=\"async\" class=\"lazyload\" src=\"https:\/\/external-content.duckduckgo.com\/iu\/?u=https:\/\/vnmedia2.monkeyuni.net\/upload\/web\/img\/6-hinh-thang.png\" alt=\"C\u00f4ng th\u1ee9c cho chu vi, khu v\u1ef1c h\u00ecnh thang. (\u1ea2nh: B\u1ed9 s\u01b0u t\u1eadp Internet)\" width=\"100%\"><\/p>\n<h2 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Mot_so_loai_bai_tap_hinh_thang_pho_bien\"><\/span>M\u1ed9t s\u1ed1 lo\u1ea1i b\u00e0i t\u1eadp h\u00ecnh thang ph\u1ed5 bi\u1ebfn<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p dir=\"ltr\">\u0110\u1ec3 gi\u00fap h\u1ecdc sinh d\u1ec5 d\u00e0ng x\u00e1c \u0111\u1ecbnh v\u00e0 gi\u1ea3i quy\u1ebft c\u00e1c v\u1ea5n \u0111\u1ec1 h\u00ecnh thang, \u0111\u00e2y l\u00e0 c\u00e1c lo\u1ea1i b\u00e0i t\u1eadp m\u00e0 b\u1ea1n c\u1ea7n hi\u1ec3u.<\/p>\n<h3 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Mau_1_Tinh_toan_do_goc\"><\/span>M\u1eabu 1: T\u00ednh to\u00e1n \u0111o g\u00f3c<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p dir=\"ltr\">\u0110\u1ec3 gi\u1ea3i quy\u1ebft lo\u1ea1i b\u00e0i vi\u1ebft n\u00e0y, ch\u00fang t\u00f4i s\u1ebd s\u1eed d\u1ee5ng c\u00e1c thu\u1ed9c t\u00ednh c\u1ee7a \u0111\u01b0\u1eddng song song, t\u1ed5ng c\u1ee7a t\u1ee9 gi\u00e1c v\u00e0 ki\u1ebfn \u200b\u200bth\u1ee9c \u0111\u00e3 h\u1ecdc v\u1ec1 h\u00ecnh thang, h\u00ecnh thang v\u00e0 h\u00ecnh thang vu\u00f4ng.<\/p>\n<p dir=\"ltr\">V\u00ed d\u1ee5:<\/p>\n<p dir=\"ltr\">H\u00e3y xem x\u00e9t m\u1ed9t h\u00ecnh thang ABCD v\u1edbi hai c\u1ea1nh AB v\u00e0 CD song song v\u00e0 hai b\u00ean AD v\u00e0 BC b\u1eb1ng nhau. Ch\u00fang ta c\u1ea7n t\u00ednh to\u00e1n ph\u00e9p \u0111o g\u00f3c x trong h\u00ecnh thang n\u00e0y.<\/p>\n<p dir=\"ltr\">\u0110\u1ec3 gi\u1ea3i quy\u1ebft v\u1ea5n \u0111\u1ec1 n\u00e0y, ch\u00fang t\u00f4i s\u1ebd s\u1eed d\u1ee5ng c\u00e1c thu\u1ed9c t\u00ednh c\u1ee7a h\u00ecnh thang v\u00e0 d\u00f2ng song song. B\u1edfi v\u00ec hai b\u00ean AD v\u00e0 BC b\u1eb1ng nhau, ch\u00fang t\u00f4i bi\u1ebft r\u1eb1ng hai g\u00f3c li\u1ec1n k\u1ec1 v\u1edbi m\u1ed9t \u0111\u00e1y (A v\u00e0 B) trong h\u00ecnh thang b\u1eb1ng nhau. Do \u0111\u00f3, g\u00f3c X c\u00f3 ph\u00e9p \u0111o 180 \u0111\u1ed9 \/ 2 = 90 \u0111\u1ed9.<\/p>\n<p dir=\"ltr\">V\u00ec v\u1eady, ph\u00e9p \u0111o g\u00f3c x trong h\u00ecnh thang ABCD l\u00e0 90 \u0111\u1ed9.<\/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\u1eebng b\u1ecf l\u1ee1 !!<\/p>\n<p style=\"text-align: center\">Ch\u01b0\u01a1ng tr\u00ecnh to\u00e1n h\u1ecdc b\u1eb1ng ti\u1ebfng Anh, gi\u00fap ph\u00e1t tri\u1ec3n t\u01b0 duy theo c\u00e1ch to\u00e0n di\u1ec7n nh\u1ea5t.<\/p>\n<p style=\"text-align: center\">Nh\u1eadn t\u1ed1i \u0111a 40% \u01b0u \u0111\u00e3i ngay 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:\/\/vnmedia2.monkeyuni.net\/upload\/web\/img\/taimienphiMM.png\" width=\"185\"><\/p>\n<\/td>\n<\/tr>\n<\/table>\n<h3 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Mau_2_Chung_minh_rang_hinh_da_la_hinh_thang_hinh_thanghinh_thanghinh_thang\"><\/span>M\u1eabu 2: Ch\u1ee9ng minh r\u1eb1ng h\u00ecnh \u0111\u00e3 l\u00e0 h\u00ecnh thang h\u00ecnh thang\/h\u00ecnh thang\/h\u00ecnh thang<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p dir=\"ltr\">\u0110\u1ec3 gi\u1ea3i quy\u1ebft h\u00ecnh th\u1ee9c n\u00e0y, ch\u00fang t\u00f4i s\u1ebd s\u1eed d\u1ee5ng c\u00e1c \u0111\u1ecbnh ngh\u0129a v\u1ec1 h\u00ecnh thang, h\u00ecnh thang v\u00e0 h\u00ecnh thang vu\u00f4ng.<\/p>\n<p dir=\"ltr\">V\u00ed d\u1ee5, h\u00e3y xem x\u00e9t ABCD h\u00ecnh thang v\u1edbi hai c\u1ea1nh AB v\u00e0 CD song song v\u00e0 hai b\u00ean AD v\u00e0 BC b\u1eb1ng nhau. C\u1ea7n ph\u1ea3i ch\u1ee9ng minh r\u1eb1ng ABCD h\u00ecnh thang l\u00e0 h\u00ecnh thang.<\/p>\n<p dir=\"ltr\">\u0110\u1ec3 ch\u1ee9ng minh \u0111i\u1ec1u n\u00e0y, ch\u00fang t\u00f4i s\u1ebd ki\u1ec3m tra xem c\u00e1c c\u1ea1nh AB v\u00e0 CD d\u01b0\u1edbi c\u00f9ng c\u00f3 b\u1eb1ng nhau kh\u00f4ng. B\u1edfi v\u00ec hai b\u00ean n\u00e0y b\u1eb1ng nhau, ch\u00fang ta c\u00f3 th\u1ec3 k\u1ebft lu\u1eadn r\u1eb1ng ABCD h\u00ecnh thang l\u00e0 h\u00ecnh thang.<\/p>\n<p dir=\"ltr\">V\u00ec v\u1eady, ch\u00fang t\u00f4i \u0111\u00e3 ch\u1ee9ng minh r\u1eb1ng ABCD h\u00ecnh thang l\u00e0 m\u1ed9t h\u00ecnh thang.<\/p>\n<h3 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Mau_3_Ap_dung_cac_thuoc_tinh_de_chung_minh_cac_yeu_cau_cua_van_de\"><\/span>M\u1eabu 3: \u00c1p d\u1ee5ng c\u00e1c thu\u1ed9c t\u00ednh \u0111\u1ec3 ch\u1ee9ng minh c\u00e1c y\u00eau c\u1ea7u c\u1ee7a v\u1ea5n \u0111\u1ec1<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p dir=\"ltr\">\u0110\u1ec3 gi\u1ea3i quy\u1ebft lo\u1ea1i b\u00e0i vi\u1ebft n\u00e0y, ch\u00fang t\u00f4i s\u1ebd s\u1eed d\u1ee5ng c\u00e1c thu\u1ed9c t\u00ednh c\u1ee7a c\u1ea1nh v\u00e0 g\u00f3c c\u1ee7a h\u00ecnh thang \u0111\u01b0\u1ee3c \u0111\u1ec1 c\u1eadp \u1edf tr\u00ean. <\/p>\n<p dir=\"ltr\">C\u00f3 4 b\u01b0\u1edbc m\u00e0 b\u1ea1n c\u1ea7n th\u1ef1c hi\u1ec7n \u0111\u1ec3 gi\u1ea3i quy\u1ebft v\u1ea5n \u0111\u1ec1 n\u00e0y, bao g\u1ed3m:<\/p>\n<ol>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">\u0110\u1ecdc v\u00e0 hi\u1ec3u c\u00e1c y\u00eau c\u1ea7u v\u1ea5n \u0111\u1ec1<\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">X\u00e1c \u0111\u1ecbnh h\u00ecnh thang<\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">S\u1eed d\u1ee5ng c\u00e1c thu\u1ed9c t\u00ednh c\u1ee7a h\u00ecnh thang<\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">Ch\u1ee9ng minh y\u00eau c\u1ea7u c\u1ee7a v\u1ea5n \u0111\u1ec1<\/p>\n<\/li>\n<\/ol>\n<h3 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Mau_4_Tinh_chu_vi_dien_tich_cua_hinh_thang\"><\/span>M\u1eabu 4: T\u00ednh chu vi, di\u1ec7n t\u00edch c\u1ee7a h\u00ecnh thang<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p dir=\"ltr\">Trong h\u00ecnh th\u1ee9c t\u1eadp th\u1ec3 d\u1ee5c n\u00e0y, b\u1ea1n c\u1ea7n d\u1ef1a v\u00e0o th\u00f4ng tin m\u00e0 v\u1ea5n \u0111\u1ec1 \u0111\u00e3 cung c\u1ea5p t\u1eeb \u0111\u00f3 \u00e1p d\u1ee5ng linh ho\u1ea1t c\u00e1c c\u00f4ng th\u1ee9c t\u00ednh to\u00e1n tr\u00ean chu vi v\u00e0 khu v\u1ef1c h\u00ecnh thang \u0111\u1ec3 t\u00ednh c\u00e2u tr\u1ea3 l\u1eddi \u0111\u00fang.<\/p>\n<p dir=\"ltr\">V\u00ed d\u1ee5: Xem x\u00e9t m\u1ed9t ABCD h\u00ecnh thang v\u1edbi c\u00e1c tham s\u1ed1 sau<\/p>\n<ul>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">\u0110\u00e1y l\u1edbn AB c\u00f3 chi\u1ec1u d\u00e0i 10 cm.<\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">CD \u0111\u00e1y nh\u1ecf c\u00f3 chi\u1ec1u d\u00e0i 6 cm.<\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">Hai c\u1ea1nh AD v\u00e0 BC b\u1eb1ng nhau, m\u1ed7i c\u1ea1nh c\u00f3 chi\u1ec1u d\u00e0i 7 cm.<\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">Chi\u1ec1u cao h t\u1eeb \u0111\u1ec9nh A c\u1ee7a h\u00ecnh thang \u0111\u1ebfn \u0111\u00e1y CD d\u00e0i 4 cm.<\/p>\n<\/li>\n<\/ul>\n<p dir=\"ltr\">C\u00e2u h\u1ecfi: chu vi v\u00e0 di\u1ec7n t\u00edch c\u1ee7a ABCD h\u00ecnh thang l\u00e0 g\u00ec?<\/p>\n<p dir=\"ltr\">T\u00ednh chu vi c\u1ee7a h\u00ecnh thang: P = 10 + 6 + 7 + 7 = 30 cm<\/p>\n<p dir=\"ltr\">-&gt; V\u00ec v\u1eady, chu vi c\u1ee7a h\u00ecnh thang l\u00e0 30 cm.<\/p>\n<p dir=\"ltr\">T\u00ednh di\u1ec7n t\u00edch h\u00ecnh thang: S = (10 + 6) x 4\/2 = 16 cm2<\/p>\n<p dir=\"ltr\">-&gt; V\u00ec v\u1eady, di\u1ec7n t\u00edch c\u1ee7a h\u00ecnh thang l\u00e0 16 cm2.<\/p>\n<p dir=\"ltr\">\n<h2 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Huong_dan_giai_cac_bai_tap_hinh_thang_o_trang_9192_Sach_giao_khoa_cua_Lop_5\"><\/span>H\u01b0\u1edbng d\u1eabn gi\u1ea3i c\u00e1c b\u00e0i t\u1eadp h\u00ecnh thang \u1edf trang 91.92 S\u00e1ch gi\u00e1o khoa c\u1ee7a L\u1edbp 5<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p dir=\"ltr\">\u0110\u1ec3 gi\u00fap b\u1ea1n hi\u1ec3u r\u00f5 h\u01a1n v\u1ec1 c\u00e1c lo\u1ea1i to\u00e1n h\u1ecdc tr\u00ean, \u0111\u00e2y l\u00e0 h\u01b0\u1edbng d\u1eabn \u0111\u1ec3 gi\u1ea3i c\u00e1c b\u00e0i t\u1eadp h\u00ecnh thang Trang 91.92 S\u00e1ch gi\u00e1o khoa c\u1ee7a L\u1edbp 5 c\u1ee7a Kh\u1ec9.<\/p>\n<h3 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Bai_1_Trang_91_SGK_Lop_5\"><\/span>B\u00e0i 1 Trang 91 SGK L\u1edbp 5<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p dir=\"ltr\">\u0110\u1ec1 t\u00e0i:<\/p>\n<p dir=\"ltr\">Trong c\u00e1c h\u00ecnh \u1ea3nh sau \u0111\u00e2y, l\u00e0 h\u00ecnh thang:<\/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\/7-hinh-thang.png\" alt=\"\" width=\"100%\"><\/p>\n<p dir=\"ltr\">Tr\u1ea3 l\u1eddi:<\/p>\n<p dir=\"ltr\">Quan s\u00e1t b\u1ea3n v\u1ebd m\u00e0 ch\u00fang ta th\u1ea5y: H\u00ecnh 1, H\u00ecnh 2, H\u00ecnh 4, H\u00ecnh 5, H\u00ecnh 6 l\u00e0 h\u00ecnh thang.<\/p>\n<h3 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Bai_2_Trang_91_SGK_Lop_5\"><\/span>B\u00e0i 2 Trang 91 SGK L\u1edbp 5<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p dir=\"ltr\">\u0110\u1ec1 t\u00e0i:<\/p>\n<p dir=\"ltr\">Trong ba h\u00ecnh \u1ea3nh d\u01b0\u1edbi \u0111\u00e2y, h\u00ecnh \u1ea3nh n\u00e0o c\u00f3:<\/p>\n<ul>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">B\u1ed1n m\u1eb7t v\u00e0 b\u1ed1n g\u00f3c?<\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">Hai c\u1eb7p \u0111\u1ed1i di\u1ec7n song song?<\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">Ch\u1ec9 c\u00f3 m\u1ed9t c\u1eb7p c\u00e1c c\u1ea1nh \u0111\u1ed1i di\u1ec7n song song?<\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">C\u00f3 b\u1ed1n g\u00f3c vu\u00f4ng?<\/p>\n<\/li>\n<\/ul>\n<p><img decoding=\"async\" class=\"lazyload\" src=\"https:\/\/external-content.duckduckgo.com\/iu\/?u=https:\/\/vnmedia2.monkeyuni.net\/upload\/web\/img\/bs-hinh-thang.jpg\" alt=\"\" width=\"100%\"><\/p>\n<p dir=\"ltr\">Tr\u1ea3 l\u1eddi:<\/p>\n<ul>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">H\u00ecnh 1, H\u00ecnh 2, H\u00ecnh 3, m\u1ed7i c\u1ea1nh c\u00f3 b\u1ed1n c\u1ea1nh v\u00e0 b\u1ed1n g\u00f3c.<\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">H\u00ecnh 1, H\u00ecnh 2, m\u1ed7i c\u1eb7p c\u00f3 hai c\u1eb7p \u0111\u1ed1i di\u1ec7n song song.<\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">H\u00ecnh 3 ch\u1ec9 c\u00f3 m\u1ed9t c\u1eb7p \u0111\u1ed1i di\u1ec7n song song.<\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">H\u00ecnh 1 c\u00f3 b\u1ed1n g\u00f3c vu\u00f4ng.<\/p>\n<\/li>\n<\/ul>\n<h3 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Bai_3_Trang_92_SGK_Lop_5\"><\/span>B\u00e0i 3 Trang 92 SGK L\u1edbp 5<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p dir=\"ltr\">\u0110\u1ec1 t\u00e0i:<\/p>\n<p dir=\"ltr\">V\u1ebd th\u00eam hai \u0111\u01b0\u1eddng th\u1eb3ng trong m\u1ed7i h\u00ecnh \u1ea3nh b\u00ean d\u01b0\u1edbi \u0111\u1ec3 l\u1ea5y h\u00ecnh thang:<\/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\/8-hinh-thang.png\" alt=\"\" width=\"400\" height=\"142\"><\/p>\n<p dir=\"ltr\">Tr\u1ea3 l\u1eddi:<\/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\/9-hinh-thang.png\" alt=\"\" width=\"400\" height=\"142\"><\/p>\n<p dir=\"ltr\">L\u01b0u \u00fd: C\u00f3 nhi\u1ec1u c\u00e1ch \u0111\u1ec3 v\u1ebd th\u00eam hai \u0111\u01b0\u1eddng th\u1eb3ng v\u00e0o m\u1ed7i h\u00ecnh \u1ea3nh \u0111\u00e3 cho \u0111\u1ec3 c\u00f3 \u0111\u01b0\u1ee3c h\u00ecnh thang, b\u1ea1n c\u00f3 th\u1ec3 ch\u1ecdn c\u00e1ch th\u00edch h\u1ee3p.<\/p>\n<h3 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Bai_4_Trang_92_SGK_Lop_5\"><\/span>B\u00e0i 4 Trang 92 SGK L\u1edbp 5<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p dir=\"ltr\">\u0110\u1ec1 t\u00e0i:<\/p>\n<p dir=\"ltr\">G\u00f3c n\u00e0o ABCD h\u00ecnh thang l\u00e0 g\u00f3c \u0111\u00fang? B\u00ean n\u00e0o vu\u00f4ng g\u00f3c v\u1edbi hai \u0111\u00e1y?<\/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\/10-hinh-thang.png\" alt=\"\" width=\"400\" height=\"283\"><\/p>\n<p dir=\"ltr\">Tr\u1ea3 l\u1eddi:<\/p>\n<ul>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">ABCD h\u00ecnh thang c\u00f3 g\u00f3c A v\u00e0 g\u00f3c D l\u00e0 g\u00f3c vu\u00f4ng.<\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">B\u00ean c\u1ea1nh AD l\u00e0 vu\u00f4ng g\u00f3c v\u1edbi hai \u0111\u00e1y. \u0110\u1ed3ng th\u1eddi, b\u00ean c\u1ea1nh qu\u1ea3ng c\u00e1o c\u0169ng l\u00e0 chi\u1ec1u cao c\u1ee7a ABCD h\u00ecnh thang vu\u00f4ng.<\/p>\n<\/li>\n<\/ul>\n<p>Xem th\u00eam:<\/p>\n<ol>\n<li>Shining Home &#8211; Gia \u0111\u00ecnh Anh Ng\u1eef Math &#8211; \u1ee8ng d\u1ee5ng to\u00e1n h\u1ecdc b\u1eb1ng ti\u1ebfng Anh s\u1ed1 1 cho tr\u1ebb m\u1eabu gi\u00e1o &amp; tr\u01b0\u1eddng ti\u1ec3u h\u1ecdc<\/li>\n<li>H\u01b0\u1edbng d\u1eabn v\u1ec1 c\u00e1ch t\u00ednh gi\u00e1 tr\u1ecb c\u1ee7a c\u00e1c bi\u1ec3u th\u1ee9c v\u00e0 b\u00e0i t\u1eadp t\u1eadp th\u1ec3 d\u1ee5c<\/li>\n<\/ol>\n<h2 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Cach_huong_dan_tre_hoc_va_thuc_hien_cac_bai_tap_hinh_thang_mot_cach_hieu_qua\"><\/span>C\u00e1ch h\u01b0\u1edbng d\u1eabn tr\u1ebb h\u1ecdc v\u00e0 th\u1ef1c hi\u1ec7n c\u00e1c b\u00e0i t\u1eadp h\u00ecnh thang m\u1ed9t c\u00e1ch hi\u1ec7u qu\u1ea3<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p dir=\"ltr\">\u0110\u1ec3 h\u01b0\u1edbng d\u1eabn tr\u1ebb h\u1ecdc v\u00e0 l\u00e0m m\u1ed9t h\u00ecnh thang hi\u1ec7u qu\u1ea3, n\u00f3 \u0111\u00f2i h\u1ecfi m\u1ed9t n\u1ed7 l\u1ef1c l\u1edbn t\u1eeb cha m\u1eb9. \u0110\u1ec3 gi\u00fap b\u1ea1n gi\u1ea3m th\u1eddi gian v\u00e0 c\u00f4ng s\u1ee9c khi d\u1ea1y tr\u1ebb h\u1ecdc to\u00e1n, \u0111\u00e2y l\u00e0 m\u1ed9t s\u1ed1 b\u00ed m\u1eadt cho b\u1ea1n:<\/p>\n<ul>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">Gi\u1ea3i th\u00edch v\u1ec1 h\u00ecnh thang: B\u1eaft \u0111\u1ea7u b\u1eb1ng c\u00e1ch gi\u1edbi thi\u1ec7u c\u00e1c kh\u00e1i ni\u1ec7m h\u00ecnh thang v\u00e0 t\u00ednh ch\u1ea5t c\u01a1 b\u1ea3n (nh\u01b0: hai c\u1ea1nh d\u01b0\u1edbi song song, hai c\u1ea1nh b\u1eb1ng nhau, g\u00f3c h\u00ecnh thang v\u00e0 c\u00e1c d\u1ea1ng h\u00ecnh thang \u0111\u1eb7c bi\u1ec7t). <\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">Truy c\u1eadp ki\u1ebfn \u200b\u200bth\u1ee9c: S\u1eed d\u1ee5ng h\u00ecnh \u1ea3nh, m\u00f4 h\u00ecnh ho\u1eb7c b\u1ea3ng m\u00f4 ph\u1ecfng \u0111\u1ec3 tr\u1ef1c quan h\u00f3a ki\u1ebfn \u200b\u200bth\u1ee9c v\u1ec1 h\u00ecnh thang. Tr\u1ebb em th\u01b0\u1eddng hi\u1ec3u v\u00e0 nh\u1edb nhi\u1ec1u h\u01a1n khi c\u00f3 h\u00ecnh minh h\u1ecda.<\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">T\u1eebng b\u01b0\u1edbc: Khi l\u00e0m b\u00e0i t\u1eadp v\u1ec1 nh\u00e0, h\u01b0\u1edbng d\u1eabn tr\u1ebb t\u1eebng b\u01b0\u1edbc. Gi\u1ea3i th\u00edch r\u00f5 r\u00e0ng l\u00e0m th\u1ebf n\u00e0o \u0111\u1ec3 t\u00ecm th\u1ea5y khu v\u1ef1c, chu vi v\u00e0 \u0111\u1eb7c \u0111i\u1ec3m c\u1ee7a h\u00ecnh thang. H\u00e3y ch\u1eafc ch\u1eafn r\u1eb1ng tr\u1ebb em hi\u1ec3u c\u00e1ch \u00e1p d\u1ee5ng c\u00e1c c\u00f4ng th\u1ee9c cho t\u1eebng b\u00e0i t\u1eadp c\u1ee5 th\u1ec3.<\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">Th\u1ef1c h\u00e0nh nhi\u1ec1u l\u1ea7n: H\u00e3y \u0111\u1ec3 tr\u1ebb th\u1ef1c h\u00e0nh nhi\u1ec1u b\u00e0i t\u1eadp kh\u00e1c nhau v\u1ec1 h\u00ecnh thang. \u0110\u1ec3 l\u00e0m cho tr\u1ebb c\u1ea3m th\u1ea5y t\u1ef1 tin h\u01a1n, h\u00e3y b\u1eaft \u0111\u1ea7u t\u1eeb nh\u1eefng kh\u00f3 kh\u0103n d\u1ec5 d\u00e0ng v\u00e0 t\u0103ng d\u1ea7n.<\/p>\n<\/li>\n<\/ul>\n<p dir=\"ltr\">N\u1ebfu b\u1ea1n \u0111ang t\u00ecm ki\u1ebfm m\u1ed9t gi\u1ea3i ph\u00e1p to\u00e1n h\u1ecdc t\u1ea1i nh\u00e0 hi\u1ec7u qu\u1ea3 cho con b\u1ea1n, Shining Home &#8211; Gia \u0111\u00ecnh Anh Ng\u1eef Math l\u00e0 m\u1ed9t trong nh\u1eefng l\u1ef1a ch\u1ecdn t\u1ed1t m\u00e0 b\u1ea1n n\u00ean xem x\u00e9t. \u1ee8ng d\u1ee5ng h\u1ee9a h\u1eb9n s\u1ebd gi\u00fap tr\u1ebb ph\u00e1t tri\u1ec3n tr\u00ed th\u00f4ng minh v\u01b0\u1ee3t tr\u1ed9i trong th\u1eddi k\u1ef3 v\u00e0ng c\u1ee7a n\u00e3o, v\u00ec c\u00e1c ph\u01b0\u01a1ng ph\u00e1p h\u1ecdc t\u1eadp hi\u1ec7n \u0111\u1ea1i v\u00e0 n\u1ed9i dung \u0111\u1ed5i m\u1edbi &#8211; s\u00e1ng t\u1ea1o nh\u01b0ng v\u1eabn \u0111\u1ea3m b\u1ea3o ch\u1ea5t l\u01b0\u1ee3ng v\u00e0 theo s\u00e1t ch\u01b0\u01a1ng tr\u00ecnh gi\u00e1o d\u1ee5c chung m\u1edbi 2018. B\u00ean c\u1ea1nh \u0111\u00f3, Shining Home &#8211; Gia \u0111\u00ecnh Anh Ng\u1eef Math c\u0169ng l\u00e0 m\u1ed9t ph\u1ea7n m\u1ec1m gi\u00fap tr\u1ebb ph\u00e1t tri\u1ec3n \u0111\u1ed3ng b\u1ed9 c\u1ea3 v\u1ec1 suy ngh\u0129 v\u00e0 ng\u00f4n ng\u1eef. <em>(C\u1ea3 hai b\u00e1n c\u1ea7u n\u00e3o)<\/em> Nh\u1edd s\u1ef1 k\u1ebft h\u1ee3p c\u1ee7a vi\u1ec7c h\u1ecdc to\u00e1n b\u1eb1ng ti\u1ebfng Anh.<\/p>\n<p dir=\"ltr\">Shining Home &#8211; Gia \u0111\u00ecnh Anh Ng\u1eef Math c\u00f3 h\u01a1n 100.000 l\u01b0\u1ee3t t\u1ea3i xu\u1ed1ng t\u1eeb Ch Play v\u00e0 App Store, b\u1ea1n \u0111ang ch\u1edd g\u00ec m\u00e0 kh\u00f4ng \u0111\u0103ng k\u00fd t\u00e0i kho\u1ea3n ngay t\u1ea1i \u0111\u00e2y \u0111\u1ec3 \u0111\u01b0\u1ee3c gi\u1ea3m gi\u00e1 t\u1edbi 40% v\u00e0 nhi\u1ec1u t\u00e0i li\u1ec7u h\u1ecdc t\u1eadp mi\u1ec5n ph\u00ed!<\/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\/11-hinh-thang.jpg\" alt=\"Shining Home - Gia \u0111\u00ecnh Anh Ng\u1eef Math - \u1ee8ng d\u1ee5ng to\u00e1n h\u1ecdc b\u1eb1ng ti\u1ebfng Anh s\u1ed1 1 cho tr\u1ebb m\u1eabu gi\u00e1o &amp; tr\u1ebb em ti\u1ec3u h\u1ecdc. (\u1ea2nh: Kh\u1ec9)\" width=\"100%\"><\/p>\n<\/p>\n<p dir=\"ltr\">H\u00e3y nh\u1edb r\u1eb1ng th\u1ef1c h\u00e0nh th\u01b0\u1eddng xuy\u00ean l\u00e0 ch\u00eca kh\u00f3a \u0111\u1ec3 gi\u00fap tr\u1ebb l\u00e0m ch\u1ee7 l\u01b0\u1ee3ng ki\u1ebfn \u200b\u200bth\u1ee9c m\u1edbi v\u1ec1 to\u00e1n h\u1ecdc m\u1ed9t c\u00e1ch nhanh ch\u00f3ng v\u00e0 hi\u1ec7u qu\u1ea3. Hy v\u1ecdng r\u1eb1ng th\u00f4ng tin m\u00e0 kh\u1ec9 chia s\u1ebb \u1edf tr\u00ean s\u1ebd gi\u00fap tr\u1ebb em chinh ph\u1ee5c ho\u00e0n to\u00e0n t\u1ea5t c\u1ea3 ki\u1ebfn \u200b\u200bth\u1ee9c v\u1ec1 h\u00ecnh thang trong to\u00e1n h\u1ecdc.<\/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>Trapezoid l\u00e0 m\u1ed9t trong nh\u1eefng kh\u00e1i ni\u1ec7m c\u01a1 b\u1ea3n trong h\u00ecnh h\u1ecdc c\u1ee7a to\u00e1n h\u1ecdc v\u00e0 th\u01b0\u1eddng g\u1eb7p trong ch\u01b0\u01a1ng tr\u00ecnh gi\u00e1o d\u1ee5c. Trong b\u00e0i vi\u1ebft n\u00e0y, ch\u00fang ta s\u1ebd t\u00ecm hi\u1ec3u t\u1ea5t c\u1ea3 ki\u1ebfn \u200b\u200bth\u1ee9c v\u1ec1 h\u00ecnh thang t\u1eeb kh\u00e1i ni\u1ec7m \u0111\u1ebfn c\u00e1c thu\u1ed9c t\u00ednh \u0111\u1eb7c tr\u01b0ng v\u00e0 d\u1ea5u hi\u1ec7u nh\u1eadn d\u1ea1ng h\u00ecnh thang&#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-14246","post","type-post","status-publish","format-standard","hentry","category-kien-thuc"],"_links":{"self":[{"href":"https:\/\/www.ckconitsha.com\/vn\/wp-json\/wp\/v2\/posts\/14246","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=14246"}],"version-history":[{"count":2,"href":"https:\/\/www.ckconitsha.com\/vn\/wp-json\/wp\/v2\/posts\/14246\/revisions"}],"predecessor-version":[{"id":17318,"href":"https:\/\/www.ckconitsha.com\/vn\/wp-json\/wp\/v2\/posts\/14246\/revisions\/17318"}],"wp:attachment":[{"href":"https:\/\/www.ckconitsha.com\/vn\/wp-json\/wp\/v2\/media?parent=14246"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ckconitsha.com\/vn\/wp-json\/wp\/v2\/categories?post=14246"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ckconitsha.com\/vn\/wp-json\/wp\/v2\/tags?post=14246"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}