{"id":17980,"date":"2025-07-05T21:45:04","date_gmt":"2025-07-05T14:45:04","guid":{"rendered":"https:\/\/www.ckconitsha.com\/vn\/?p=17980"},"modified":"2025-07-05T23:05:15","modified_gmt":"2025-07-05T16:05:15","slug":"tong-hop-kien-thuc-hinh-chu-nhat-day-du-chi-tiet-nhat","status":"publish","type":"post","link":"https:\/\/www.ckconitsha.com\/vn\/tong-hop-kien-thuc-hinh-chu-nhat-day-du-chi-tiet-nhat\/","title":{"rendered":"T\u1ed5ng h\u1ee3p ki\u1ebfn th\u1ee9c h\u00ecnh ch\u1eef nh\u1eadt \u0111\u1ea7y \u0111\u1ee7 chi ti\u1ebft nh\u1ea5t"},"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\/tong-hop-kien-thuc-hinh-chu-nhat-day-du-chi-tiet-nhat\/#Hinh_chu_nhat_la_gi\" >H\u00ecnh ch\u1eef nh\u1eadt 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\/tong-hop-kien-thuc-hinh-chu-nhat-day-du-chi-tiet-nhat\/#Tinh_chat_hinh_chu_nhat\" >T\u00ednh ch\u1ea5t h\u00ecnh ch\u1eef nh\u1eadt<\/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\/tong-hop-kien-thuc-hinh-chu-nhat-day-du-chi-tiet-nhat\/#Dau_hieu_nhan_biet_hinh_chu_nhat\" >D\u1ea5u hi\u1ec7u nh\u1eadn bi\u1ebft h\u00ecnh ch\u1eef nh\u1eadt<\/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\/tong-hop-kien-thuc-hinh-chu-nhat-day-du-chi-tiet-nhat\/#Cac_dinh_nghia_khac_lien_quan_toi_hinh_chu_nhat\" >C\u00e1c \u0111\u1ecbnh ngh\u0129a kh\u00e1c li\u00ean quan t\u1edbi h\u00ecnh ch\u1eef nh\u1eadt<\/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\/tong-hop-kien-thuc-hinh-chu-nhat-day-du-chi-tiet-nhat\/#Duong_cheo_cua_hinh_chu_nhat\" >\u0110\u01b0\u1eddng ch\u00e9o c\u1ee7a h\u00ecnh ch\u1eef nh\u1eadt<\/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\/tong-hop-kien-thuc-hinh-chu-nhat-day-du-chi-tiet-nhat\/#Truc_doi_xung_hinh_chu_nhat\" >Tr\u1ee5c \u0111\u1ed1i x\u1ee9ng h\u00ecnh ch\u1eef nh\u1eadt<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/www.ckconitsha.com\/vn\/tong-hop-kien-thuc-hinh-chu-nhat-day-du-chi-tiet-nhat\/#Tam_doi_xung_hinh_chu_nhat\" >T\u00e2m \u0111\u1ed1i x\u1ee9ng h\u00ecnh ch\u1eef nh\u1eadt<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/www.ckconitsha.com\/vn\/tong-hop-kien-thuc-hinh-chu-nhat-day-du-chi-tiet-nhat\/#Duong_tron_ngoai_tiep_hcn\" >\u0110\u01b0\u1eddng tr\u00f2n ngo\u1ea1i ti\u1ebfp hcn<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/www.ckconitsha.com\/vn\/tong-hop-kien-thuc-hinh-chu-nhat-day-du-chi-tiet-nhat\/#Cac_cong_thuc_lien_quan_toi_hinh_chu_nhat\" >C\u00e1c c\u00f4ng th\u1ee9c li\u00ean quan t\u1edbi h\u00ecnh ch\u1eef nh\u1eadt<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/www.ckconitsha.com\/vn\/tong-hop-kien-thuc-hinh-chu-nhat-day-du-chi-tiet-nhat\/#Cong_thuc_tinh_chu_vi_hcn\" >C\u00f4ng th\u1ee9c t\u00ednh chu vi hcn<\/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\/tong-hop-kien-thuc-hinh-chu-nhat-day-du-chi-tiet-nhat\/#Cong_thuc_tinh_dien_tich_hinh_chu_nhat\" >C\u00f4ng th\u1ee9c t\u00ednh di\u1ec7n t\u00edch h\u00ecnh ch\u1eef nh\u1eadt<\/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\/tong-hop-kien-thuc-hinh-chu-nhat-day-du-chi-tiet-nhat\/#Cac_dang_bai_tap_ve_hinh_chu_nhat_tieu_hoc_thuong_gap\" >C\u00e1c d\u1ea1ng b\u00e0i t\u1eadp v\u1ec1 h\u00ecnh ch\u1eef nh\u1eadt ti\u1ec3u h\u1ecdc 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-13\" href=\"https:\/\/www.ckconitsha.com\/vn\/tong-hop-kien-thuc-hinh-chu-nhat-day-du-chi-tiet-nhat\/#Dang_1_Cong_thuc_dinh_nghia\" >D\u1ea1ng 1: C\u00f4ng th\u1ee9c \u0111\u1ecbnh ngh\u0129a<\/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\/tong-hop-kien-thuc-hinh-chu-nhat-day-du-chi-tiet-nhat\/#Dang_2_Tinh_chu_vi_hinh_chu_nhat\" >D\u1ea1ng 2: T\u00ednh chu vi h\u00ecnh ch\u1eef nh\u1eadt<\/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\/tong-hop-kien-thuc-hinh-chu-nhat-day-du-chi-tiet-nhat\/#Dang_3_Tinh_dien_tich_hinh_chu_nhat\" >D\u1ea1ng 3: T\u00ednh di\u1ec7n t\u00edch h\u00ecnh ch\u1eef nh\u1eadt<\/a><\/li><\/ul><\/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\/tong-hop-kien-thuc-hinh-chu-nhat-day-du-chi-tiet-nhat\/#Bai_tap_toan_lien_quan_toi_hinh_chu_nhat_de_be_luyen_tap\" >B\u00e0i t\u1eadp to\u00e1n li\u00ean quan t\u1edbi h\u00ecnh ch\u1eef nh\u1eadt \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-17\" href=\"https:\/\/www.ckconitsha.com\/vn\/tong-hop-kien-thuc-hinh-chu-nhat-day-du-chi-tiet-nhat\/#Bi_quyet_giup_be_hoc_ghi_nho_kien_thuc_hinh_chu_nhat_hieu_qua\" >B\u00ed quy\u1ebft gi\u00fap b\u00e9 h\u1ecdc, ghi nh\u1edb ki\u1ebfn th\u1ee9c h\u00ecnh ch\u1eef nh\u1eadt 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-18\" href=\"https:\/\/www.ckconitsha.com\/vn\/tong-hop-kien-thuc-hinh-chu-nhat-day-du-chi-tiet-nhat\/#Tao_su_hung_thu_va_niem_dam_me_hoc_toan_cho_tre_voi_Shining_Home_%E2%80%93_Gia_dinh_Anh_Ngu_Math\" >T\u1ea1o s\u1ef1 h\u1ee9ng th\u00fa v\u00e0 ni\u1ec1m \u0111am m\u00ea h\u1ecdc to\u00e1n cho tr\u1ebb v\u1edbi 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-19\" href=\"https:\/\/www.ckconitsha.com\/vn\/tong-hop-kien-thuc-hinh-chu-nhat-day-du-chi-tiet-nhat\/#Dam_bao_be_nam_vung_kien_thuc_co_ban_ve_hinh_chu_nhat\" >\u0110\u1ea3m b\u1ea3o b\u00e9 n\u1eafm v\u1eefng ki\u1ebfn th\u1ee9c c\u01a1 b\u1ea3n v\u1ec1 h\u00ecnh ch\u1eef nh\u1eadt<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-20\" href=\"https:\/\/www.ckconitsha.com\/vn\/tong-hop-kien-thuc-hinh-chu-nhat-day-du-chi-tiet-nhat\/#Cung_be_luyen_tap_thuc_hanh_thuong_xuyen\" >C\u00f9ng b\u00e9 luy\u1ec7n t\u1eadp, th\u1ef1c h\u00e0nh 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-21\" href=\"https:\/\/www.ckconitsha.com\/vn\/tong-hop-kien-thuc-hinh-chu-nhat-day-du-chi-tiet-nhat\/#Yeu_cau_be_doc_va_hieu_de_bai_tap\" >Y\u00eau c\u1ea7u b\u00e9 \u0111\u1ecdc v\u00e0 hi\u1ec3u \u0111\u1ec1 b\u00e0i t\u1eadp<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-22\" href=\"https:\/\/www.ckconitsha.com\/vn\/tong-hop-kien-thuc-hinh-chu-nhat-day-du-chi-tiet-nhat\/#Ket_luan\" >K\u1ebft lu\u1eadn<\/a><\/li><\/ul><\/nav><\/div>\n<\/p>\n<p>H\u00ecnh ch\u1eef nh\u1eadt thu\u1ed9c h\u00ecnh t\u1ee9 gi\u00e1c \u0111\u1eb7c bi\u1ec7t, c\u0169ng nh\u01b0 l\u00e0 m\u1ed9t lo\u1ea1i h\u00ecnh h\u1ecdc c\u01a1 b\u1ea3n v\u00e0 ph\u1ed5 bi\u1ebfn hi\u1ec7n nay. \u0110\u1ec3 c\u00f3 th\u1ec3 hi\u1ec3u r\u00f5 h\u01a1n v\u1ec1 ki\u1ebfn th\u1ee9c c\u1ee7a h\u00ecnh h\u1ecdc n\u00e0y, h\u00e3y c\u00f9ng Shining Home &#8211; Gia \u0111\u00ecnh Anh Ng\u1eef tham kh\u1ea3o chi ti\u1ebft trong 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\/img_default\/monkey3.png\" alt=\"\"><\/p>\n<p class=\"title\">H\u00e0ng tri\u1ec7u tr\u1ebb em \u0111\u00e3 ph\u00e1t tri\u1ec3n kh\u1ea3 n\u0103ng ng\u00f4n ng\u1eef c\u1ee7a m\u00ecnh th\u00f4ng qua c\u00e1c \u1ee9ng d\u1ee5ng h\u1ecdc t\u1eadp c\u1ee7a Shining Home &#8211; Gia \u0111\u00ecnh Anh Ng\u1eef<\/p>\n<p class=\"description\">\u0110\u0103ng k\u00fd ngay \u0111\u1ec3 \u0111\u01b0\u1ee3c Shining Home &#8211; Gia \u0111\u00ecnh Anh Ng\u1eef t\u01b0 v\u1ea5n mi\u1ec5n ph\u00ed v\u1ec1 s\u1ea3n ph\u1ea9m v\u00e0 l\u1ed9 tr\u00ecnh h\u1ecdc cho con.<\/p>\n<p>                                                                            *Vui l\u00f2ng ki\u1ec3m tra l\u1ea1i h\u1ecd t\u00ean<\/p>\n<p>                                                                            *Vui l\u00f2ng ki\u1ec3m tra l\u1ea1i S\u0110T<\/p>\n<p>                                                                                Th\u00e0nh th\u1ea1o 2.000+ t\u1eeb &amp; 6.000 c\u00e2u ti\u1ebfng anh<br \/>\n                                                                                Ph\u00e1t tri\u1ec3n to\u00e0n di\u1ec7n 4 k\u1ef9 n\u0103ng ti\u1ebfng anh<br \/>\n                                                                                Gi\u1ecfi To\u00e1n &#8211; ti\u1ebfng Anh theo ph\u01b0\u01a1ng ph\u00e1p hi\u1ec7n \u0111\u1ea1i<br \/>\n                                                                                Ph\u00e1t tri\u1ec3n EQ &amp; kh\u1ea3 n\u0103ng ti\u1ebfng Vi\u1ec7t<\/p>\n<p>                                                                                *B\u1ea1n ch\u01b0a ch\u1ecdn m\u1ee5c n\u00e0o!<\/p>\n<p>                                                                    \u0110\u0103ng K\u00fd T\u01b0 V\u1ea5n Mi\u1ec5n Ph\u00ed<\/p>\n<h2 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Hinh_chu_nhat_la_gi\"><\/span>H\u00ecnh ch\u1eef nh\u1eadt l\u00e0 g\u00ec?<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 ch\u1eef nh\u1eadt (hcn) \u0111\u01b0\u1ee3c bi\u1ebft \u0111\u1ebfn l\u00e0 h\u00ecnh t\u1ee9 gi\u00e1c \u0111\u1eb7c bi\u1ec7t v\u1edbi 4 g\u00f3c vu\u00f4ng, ho\u1eb7c \u0111\u00f3 l\u00e0 h\u00ecnh b\u00ecnh h\u00e0nh c\u00f3 m\u1ed9t g\u00f3c vu\u00f4ng.<\/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\/hinh-chu-nhat-1.png\" alt=\"\u0110\u1eb7c \u0111i\u1ec3m h\u00ecnh ch\u1eef nh\u1eadt. (\u1ea2nh: S\u01b0u t\u1ea7m internet)\" width=\"100%\"><\/p>\n<h2 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Tinh_chat_hinh_chu_nhat\"><\/span>T\u00ednh ch\u1ea5t h\u00ecnh ch\u1eef nh\u1eadt<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<ul>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">H\u00ecnh ch\u1eef nh\u1eadt c\u00f3 h\u1ea7u h\u1ebft nh\u1eefng t\u00ednh ch\u1ea5t c\u1ee7a h\u00ecnh b\u00ecnh h\u00e0nh v\u00e0 h\u00ecnh thang c\u00e2n<\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">Hai \u0111\u01b0\u1eddng ch\u00e9o h\u00ecnh ch\u1eef nh\u1eadt c\u1eaft nhau v\u00e0 b\u1eb1ng nhau t\u1ea1i trung \u0111i\u1ec3m m\u1ed7i \u0111\u01b0\u1eddng, c\u0169ng nh\u01b0 t\u1ea1o th\u00e0nh 4 tam gi\u00e1c c\u00e2n.<\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">N\u1ed9i ti\u1ebfp \u0111\u01b0\u1eddng tr\u00f2n c\u00f3 t\u00e2m l\u00e0 t\u00e2m c\u1ee7a h\u00ecnh.<\/p>\n<\/li>\n<\/ul>\n<h2 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Dau_hieu_nhan_biet_hinh_chu_nhat\"><\/span>D\u1ea5u hi\u1ec7u nh\u1eadn bi\u1ebft h\u00ecnh ch\u1eef nh\u1eadt<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p dir=\"ltr\">\u0110\u1ec3 c\u00f3 th\u1ec3 nh\u1eadn bi\u1ebft \u0111\u01b0\u1ee3c h\u00ecnh ch\u1eef nh\u1eadt m\u1ecdi ng\u01b0\u1eddi c\u00f3 th\u1ec3 d\u1ef1a v\u00e0o nh\u1eefng \u0111\u1eb7c \u0111i\u1ec3m 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\/hinh-chu-nhat-2.jpg\" alt=\"H\u1ecdc sinh c\u1ea7n n\u1eafm v\u1eefng d\u1ea5u hi\u1ec7u nh\u1eadn bi\u1ebft h\u00ecnh. (\u1ea2nh: S\u01b0u t\u1ea7m internet)\" width=\"100%\"><\/p>\n<ul>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">T\u1ee9 gi\u00e1c c\u00f3 ba g\u00f3c vu\u00f4ng l\u00e0 h\u00ecnh ch\u1eef nh\u1eadt.<\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">H\u00ecnh thang c\u00e2n c\u00f3 m\u1ed9t g\u00f3c vu\u00f4ng l\u00e0 h\u00ecnh ch\u1eef nh\u1eadt.<\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">H\u00ecnh b\u00ecnh h\u00e0nh c\u00f3 m\u1ed9t g\u00f3c vu\u00f4ng l\u00e0 h\u00ecnh ch\u1eef nh\u1eadt.<\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">H\u00ecnh b\u00ecnh h\u00e0nh c\u00f3 hai \u0111\u01b0\u1eddng ch\u00e9o b\u1eb1ng nhau l\u00e0 h\u00ecnh ch\u1eef nh\u1eadt.<\/p>\n<\/li>\n<\/ul>\n<h2 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Cac_dinh_nghia_khac_lien_quan_toi_hinh_chu_nhat\"><\/span>C\u00e1c \u0111\u1ecbnh ngh\u0129a kh\u00e1c li\u00ean quan t\u1edbi h\u00ecnh ch\u1eef nh\u1eadt<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p dir=\"ltr\">Trong h\u00ecnh ch\u1eef nh\u1eadt, ngo\u00e0i nh\u1eefng \u0111\u1eb7c \u0111i\u1ec3m t\u00ednh ch\u1ea5t tr\u00ean th\u00ec v\u1eabn s\u1ebd c\u00f2n c\u00f3 m\u1ed9t s\u1ed1 \u0111\u1ecbnh ngh\u0129a li\u00ean quan m\u00e0 m\u1ecdi ng\u01b0\u1eddi c\u1ea7n n\u1eafm r\u00f5 sau \u0111\u00e2y:<\/p>\n<h3 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Duong_cheo_cua_hinh_chu_nhat\"><\/span>\u0110\u01b0\u1eddng ch\u00e9o c\u1ee7a h\u00ecnh ch\u1eef nh\u1eadt<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p dir=\"ltr\">\u0110\u1ecbnh ngh\u0129a: \u0110\u00e2y l\u00e0 \u0111\u01b0\u1eddng n\u1ed1i 2 \u0111\u1ec9nh \u0111\u1ed1i di\u1ec7n nhau c\u1ee7a h\u00ecnh. M\u1ed7i h\u00ecnh ch\u1eef nh\u1eadt s\u1ebd c\u00f3 2 \u0111\u01b0\u1eddng ch\u00e9o b\u1eb1ng nhau.<\/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\/hinh-chu-nhat-3.jpg\" alt=\"\u0110\u1eb7c \u0111i\u1ec3m \u0111\u01b0\u1eddng ch\u00e9o hcn. (\u1ea2nh: S\u01b0u t\u1ea7m internet)\" width=\"100%\"><\/p>\n<p dir=\"ltr\">T\u00ednh ch\u1ea5t:<\/p>\n<ul>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">\u0110\u01b0\u1eddng ch\u00e9o chia hcn th\u00e0nh 2 tam gi\u00e1c vu\u00f4ng ngang b\u1eb1ng nhau<\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">Hai \u0111\u01b0\u1eddng ch\u00e9o c\u1ee7a hcn c\u1eaft nhau t\u1ea1i trung \u0111i\u1ec3m m\u1ed7i \u0111\u01b0\u1eddng.<\/p>\n<\/li>\n<\/ul>\n<p dir=\"ltr\">C\u00f4ng th\u1ee9c t\u00ednh \u0111\u01b0\u1eddng ch\u00e9o h\u00ecnh ch\u1eef nh\u1eadt: c = a2 + b2 =&gt; c = \u221aa2 + b2<\/p>\n<p dir=\"ltr\">Trong \u0111\u00f3:<\/p>\n<ul>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">c l\u00e0 \u0111\u01b0\u1eddng ch\u00e9o h\u00ecnh vu\u00f4ng.<\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">a, b l\u00e0 c\u1ea1nh b\u00ean h\u00ecnh vu\u00f4ng.<\/p>\n<\/li>\n<\/ul>\n<h3 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Truc_doi_xung_hinh_chu_nhat\"><\/span>Tr\u1ee5c \u0111\u1ed1i x\u1ee9ng h\u00ecnh ch\u1eef nh\u1eadt<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p dir=\"ltr\">\u0110\u1ecbnh ngh\u0129a: M\u1ed9t \u0111\u01b0\u1eddng th\u1eb3ng ch\u00ednh l\u00e0 tr\u1ee5c \u0111\u1ed1i x\u1ee9ng c\u1ee7a h\u00ecnh khi ph\u00e9p \u0111\u1ed1i x\u1ee9ng tr\u1ee5c qua qua \u0111\u01b0\u1eddng th\u1eb3ng \u0111\u00f3, bi\u1ebfn h\u00ecnh \u0111\u00f3 th\u00e0nh ch\u00ednh n\u00f3. V\u1edbi h\u00ecnh ch\u1eef nh\u1eadt, tr\u1ee5c \u0111\u1ed1i x\u1ee9ng ch\u00ednh l\u00e0 2 \u0111\u01b0\u1eddng th\u1eb3ng \u0111i qua trung \u0111i\u1ec3m t\u1eebng c\u1eb7p c\u1ea1nh \u0111\u1ed1i di\u1ec7n c\u1ee7a h\u00ecnh, n\u00ean m\u1ed7i h\u00ecnh s\u1ebd c\u00f3 2 tr\u1ee5c \u0111\u1ed1i x\u1ee9ng.<\/p>\n<p dir=\"ltr\">T\u00ednh ch\u1ea5t: Hai ph\u1ea7n c\u1ee7a hcn \u0111\u01b0\u1ee3c chia ra b\u1edfi tr\u1ee5c \u0111\u1ed1i x\u1ee9ng th\u00ec t\u01b0\u01a1ng t\u1ef1 nhau.<\/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\/hinh-chu-nhat-4.jpg\" alt=\"\u0110\u1eb7c \u0111i\u1ec3m tr\u1ee5c \u0111\u1ed1i x\u1ee9ng c\u1ee7a hcn. (\u1ea2nh: S\u01b0u t\u1ea7m internet)\" width=\"100%\"><\/p>\n<h3 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Tam_doi_xung_hinh_chu_nhat\"><\/span>T\u00e2m \u0111\u1ed1i x\u1ee9ng h\u00ecnh ch\u1eef nh\u1eadt<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p dir=\"ltr\">M\u1ed9t \u0111i\u1ec3m \u0111\u01b0\u1ee3c xem l\u00e0 t\u00e2m \u0111\u1ed1i x\u1ee9ng c\u1ee7a h\u00ecnh n\u1ebfu ph\u00e9p \u0111\u1ed1i x\u1ee9ng t\u00e2m \u0111\u00f3 bi\u1ebfn h\u00ecnh \u0111\u00f3 th\u00e0nh ch\u00ednh n\u00f3, giao \u0111i\u1ec3m c\u1ee7a 2 \u0111\u01b0\u1eddng ch\u00e9o ch\u00ednh l\u00e0 t\u00e2m \u0111\u1ed1i x\u1ee9ng c\u1ee7a hcn.<\/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\/hinh-chu-nhat-5.jpg\" alt=\"\u0110\u1eb7c \u0111i\u1ec3m t\u00e2m \u0111\u1ed1i x\u1ee9ng hcn. (\u1ea2nh: S\u01b0u t\u1ea7m internet)\" width=\"100%\"><\/p>\n<h3 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Duong_tron_ngoai_tiep_hcn\"><\/span>\u0110\u01b0\u1eddng tr\u00f2n ngo\u1ea1i ti\u1ebfp hcn<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ul>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">\u0110\u01b0\u1eddng tr\u00f2n \u0111i qua c\u00e1c \u0111\u1ec9nh c\u1ee7a h\u00ecnh ch\u1eef nh\u1eadt s\u1ebd \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 \u0111\u01b0\u1eddng tr\u00f2n ngo\u1ea1i ti\u1ebfp c\u1ee7a h\u00ecnh.<\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">M\u1ed7i h\u00ecnh ch\u1eef nh\u1eadt s\u1ebd c\u00f3 duy nh\u1ea5t 1 \u0111\u01b0\u1eddng tr\u00f2n ngo\u1ea1i ti\u1ebfp.<\/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\/hinh-chu-nhat-6.jpg\" alt=\"\u0110\u1eb7c \u0111i\u1ec3m h\u00ecnh tr\u00f2n ngo\u1ea1i ti\u1ebfp hcn. (\u1ea2nh: S\u01b0u t\u1ea7m internet)\" width=\"100%\"><\/p>\n<h2 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Cac_cong_thuc_lien_quan_toi_hinh_chu_nhat\"><\/span>C\u00e1c c\u00f4ng th\u1ee9c li\u00ean quan t\u1edbi h\u00ecnh ch\u1eef nh\u1eadt<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p dir=\"ltr\">Trong ki\u1ebfn th\u1ee9c v\u1ec1 h\u00ecnh ch\u1eef nh\u1eadt, c\u00e1c b\u00e9 s\u1ebd ph\u1ea3i n\u1eafm r\u00f5 c\u00e1c c\u00f4ng th\u1ee9c t\u00ednh chu vi v\u00e0 di\u1ec7n t\u00edch t\u01b0\u01a1ng \u1ee9ng \u0111\u1ec3 gi\u1ea3i quy\u1ebft c\u00e1c b\u00e0i t\u1eadp ch\u00ednh x\u00e1c. C\u1ee5 th\u1ec3:<\/p>\n<h3 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Cong_thuc_tinh_chu_vi_hcn\"><\/span>C\u00f4ng th\u1ee9c t\u00ednh chu vi hcn<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p dir=\"ltr\">Chu vi h\u00ecnh ch\u1eef nh\u1eadt b\u1eb1ng 2 l\u1ea7n t\u1ed5ng c\u1ee7a chi\u1ec1u d\u00e0i v\u00e0 chi\u1ec1u r\u1ed9ng: C = 2 x (a+b).<\/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\/hinh-chu-nhat-7.jpg\" alt=\"H\u1ecdc sinh c\u1ea7n n\u1eafm v\u1eefng v\u1ec1 c\u00f4ng th\u1ee9c t\u00ednh chu vi hcn. (\u1ea2nh: S\u01b0u t\u1ea7m internet)\" width=\"100%\"><\/p>\n<p dir=\"ltr\"><em>V\u00ed d\u1ee5: Cho h\u00ecnh ch\u1eef nh\u1eadt ABCD, v\u1edbi chi\u1ec1u d\u00e0i l\u00e0 7cm, chi\u1ec1u r\u1ed9ng l\u00e0 5cm. T\u00ednh chu vi h\u00ecnh ch\u1eef nh\u1eadt \u0111\u00f3?<\/em><\/p>\n<p dir=\"ltr\"><em>L\u1eddi gi\u1ea3i:<\/em><\/p>\n<p dir=\"ltr\"><em>Chu vi h\u00ecnh ch\u1eef nh\u1eadt ABCD l\u00e0:<\/em><\/p>\n<p dir=\"ltr\"><em>(5 + 7) x 2= 24 (cm)<\/em><\/p>\n<p dir=\"ltr\"><em>\u0110\u00e1p s\u1ed1: 24 cm<\/em><\/p>\n<h3 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Cong_thuc_tinh_dien_tich_hinh_chu_nhat\"><\/span>C\u00f4ng th\u1ee9c t\u00ednh di\u1ec7n t\u00edch h\u00ecnh ch\u1eef nh\u1eadt<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p dir=\"ltr\">H\u00ecnh ch\u1eef nh\u1eadt \u0111\u01b0\u1ee3c bi\u1ebft \u0111\u1ebfn l\u00e0 h\u00ecnh c\u00f3 c\u00e1ch t\u00ednh di\u1ec7n t\u00edch \u0111\u01a1n gi\u1ea3n, ch\u1ec9 c\u1ea7n l\u1ea5y t\u00edch c\u1ee7a 2 c\u1ea1nh li\u1ec1n k\u1ec1.<\/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\/hinh-chu-nhat-8.jpg\" alt=\"C\u00f4ng th\u1ee9c t\u00ednh di\u1ec7n t\u00edch hcn c\u0169ng c\u1ea7n n\u1eafm b\u1eaft. (\u1ea2nh: S\u01b0u t\u1ea7m internet)\" width=\"100%\"><\/p>\n<p dir=\"ltr\">C\u00f4ng th\u1ee9c t\u00ednh di\u1ec7n t\u00edch h\u00ecnh ch\u1eef nh\u1eadt:<\/p>\n<p dir=\"ltr\" style=\"text-align: center\">S = a.b<\/p>\n<p dir=\"ltr\">Trong \u0111\u00f3:<\/p>\n<ul>\n<li dir=\"ltr\">a l\u00e0 chi\u1ec1u r\u1ed9ng c\u1ee7a h\u00ecnh ch\u1eef nh\u1eadt.<\/li>\n<li dir=\"ltr\">b l\u00e0 chi\u1ec1u d\u00e0i c\u1ee7a h\u00ecnh ch\u1eef nh\u1eadt.<\/li>\n<\/ul>\n<p dir=\"ltr\"><em>V\u00ed d\u1ee5: Cho h\u00ecnh ch\u1eef nh\u1eadt ABCD, chi\u1ec1u d\u00e0i l\u00e0 5cm, chi\u1ec1u r\u1ed9ng 4cm. H\u1ecfi di\u1ec7n t\u00edch b\u1eb1ng bao nhi\u00eau?<\/em><\/p>\n<p dir=\"ltr\"><em>L\u1eddi gi\u1ea3i:<\/em><\/p>\n<p dir=\"ltr\"><em>Di\u1ec7n t\u00edch h\u00ecnh ch\u1eef nh\u1eadt ABCD l\u00e0:<\/em><\/p>\n<p dir=\"ltr\"><em>5 x 4 = 20 (cm2)<\/em><\/p>\n<p dir=\"ltr\"><em>\u0110\u00e1p s\u1ed1: 20 cm2<\/em><\/p>\n<h2 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Cac_dang_bai_tap_ve_hinh_chu_nhat_tieu_hoc_thuong_gap\"><\/span>C\u00e1c d\u1ea1ng b\u00e0i t\u1eadp v\u1ec1 h\u00ecnh ch\u1eef nh\u1eadt ti\u1ec3u h\u1ecdc th\u01b0\u1eddng g\u1eb7p<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p dir=\"ltr\">Trong ch\u01b0\u01a1ng tr\u00ecnh to\u00e1n h\u1ecdc c\u1ea5p 1, c\u00e1c b\u00e9 s\u1ebd \u0111\u01b0\u1ee3c h\u1ecdc v\u00e0 l\u00e0m c\u00e1c d\u1ea1ng b\u00e0i t\u1eadp li\u00ean quan t\u1edbi h\u00ecnh ch\u1eef nh\u1eadt 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\/hinh-chu-nhat-9.jpg\" alt=\"C\u00f3 nhi\u1ec1u d\u1ea1ng b\u00e0i t\u1eadp li\u00ean quan t\u1edbi hcn c\u01a1 b\u1ea3n. (\u1ea2nh: S\u01b0u t\u1ea7m internet)\" width=\"100%\"><\/p>\n<h3 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Dang_1_Cong_thuc_dinh_nghia\"><\/span>D\u1ea1ng 1: C\u00f4ng th\u1ee9c \u0111\u1ecbnh ngh\u0129a<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p dir=\"ltr\">\u0110\u00e2y l\u00e0 d\u1ea1ng b\u00e0i t\u1eadp c\u01a1 b\u1ea3n, th\u01b0\u1eddng n\u1eb1m trong \u0111\u1ec1 thi tr\u1eafc nghi\u1ec7m m\u00e0 c\u00e1c b\u00e9 s\u1ebd \u0111\u01b0\u1ee3c g\u1eb7p. \u0110\u1ec1 b\u00e0i ch\u1ee7 y\u1ebfu \u0111\u01b0a ra l\u00e0 d\u1ea1ng c\u00e2u h\u1ecfi l\u00fd thuy\u1ebft li\u00ean quan t\u1edbi h\u00ecnh ch\u1eef nh\u1eadt, y\u00eau c\u1ea7u b\u00e9 ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang t\u01b0\u01a1ng \u1ee9ng v\u1edbi c\u00e2u h\u1ecfi \u0111\u1eb7t ra.<\/p>\n<p dir=\"ltr\">V\u1eady n\u00ean, \u0111\u1ec3 gi\u1ea3i \u0111\u01b0\u1ee3c b\u00e0i t\u1eadp n\u00e0y, \u0111\u00f2i h\u1ecfi c\u00e1c b\u00e9 ph\u1ea3i n\u1eafm r\u00f5 \u0111\u01b0\u1ee3c ki\u1ebfn th\u1ee9c c\u01a1 b\u1ea3n c\u1ee7a h\u00ecnh.<\/p>\n<p dir=\"ltr\"><em>V\u00ed d\u1ee5: Ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t trong c\u00e1c c\u00e2u sau:<\/em><\/p>\n<p dir=\"ltr\"><em>A. H\u00ecnh ch\u1eef nh\u1eadt l\u00e0 t\u1ee9 gi\u00e1c c\u00f3 4 c\u1ea1nh b\u1eb1ng nhau.<\/em><\/p>\n<p dir=\"ltr\"><em>B. H\u00ecnh ch\u1eef nh\u1eadt l\u00e0 h\u00ecnh t\u1ee9 gi\u00e1c c\u00f3 4 g\u00f3c vu\u00f4ng<\/em><\/p>\n<p dir=\"ltr\"><em>C. H\u00ecnh ch\u1eef nh\u1eadt l\u00e0 h\u00ecnh t\u1ee9 gi\u00e1c c\u00f3 2 g\u00f3c vu\u00f4ng<\/em><\/p>\n<p dir=\"ltr\"><em>D. C\u1ea3 A, B, C \u0111\u1ec1u sai.<\/em><\/p>\n<p dir=\"ltr\"><em>==&gt; \u0110\u00e1p \u00e1n: B. B\u1edfi v\u00ec theo \u0111\u1ecbnh ngh\u0129a, h\u00ecnh ch\u1eef nh\u1eadt l\u00e0 h\u00ecnh c\u00f3 4 g\u00f3c vu\u00f4ng.<\/em><\/p>\n<h3 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Dang_2_Tinh_chu_vi_hinh_chu_nhat\"><\/span>D\u1ea1ng 2: T\u00ednh chu vi h\u00ecnh ch\u1eef nh\u1eadt<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p dir=\"ltr\">\u0110\u00e2y c\u0169ng l\u00e0 d\u1ea1ng b\u00e0i t\u1eadp c\u01a1 b\u1ea3n m\u00e0 b\u00e9 c\u0169ng s\u1ebd \u0111\u01b0\u1ee3c l\u00e0m quen. V\u1edbi b\u00e0i t\u1eadp n\u00e0y, b\u00e9 c\u1ea7n n\u1eafm v\u1eefng c\u00f4ng th\u1ee9c t\u00ednh chu vi c\u1ee7a h\u00ecnh l\u00e0 C = 2 x (a+b), k\u1ebft h\u1ee3p c\u00f9ng v\u1edbi d\u1eef ki\u1ec7n \u0111\u1ec1 b\u00e0i \u0111\u01b0a ra \u0111\u1ec3 gi\u1ea3i b\u00e0i t\u1eadp ch\u00ednh x\u00e1c.<\/p>\n<p dir=\"ltr\"><em>V\u00ed d\u1ee5: Cho h\u00ecnh ch\u1eef nh\u1eadt ABCD, v\u1edbi chi\u1ec1u d\u00e0i l\u00e0 5cm, chi\u1ec1u r\u1ed9ng 3cm. T\u00ednh chu vi h\u00ecnh t\u01b0\u01a1ng \u1ee9ng?<\/em><\/p>\n<p dir=\"ltr\"><em>L\u1eddi gi\u1ea3i:<\/em><\/p>\n<p dir=\"ltr\"><em>Chu vi h\u00ecnh ch\u1eef nh\u1eadt ABCD l\u00e0:<\/em><\/p>\n<p dir=\"ltr\"><em>C = 2 x (a + b) = 2 x (5 + 3) = 16 cm.<\/em><\/p>\n<p dir=\"ltr\"><em>\u0110\u00e1p s\u1ed1: 16cm<\/em><\/p>\n<h3 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Dang_3_Tinh_dien_tich_hinh_chu_nhat\"><\/span>D\u1ea1ng 3: T\u00ednh di\u1ec7n t\u00edch h\u00ecnh ch\u1eef nh\u1eadt<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p dir=\"ltr\">C\u0169ng t\u01b0\u01a1ng t\u1ef1 nh\u01b0 b\u00e0i to\u00e1n t\u00ednh chu vi tr\u00ean, \u1edf b\u00e0i t\u1eadp t\u00ednh di\u1ec7n t\u00edch c\u1ee7a h\u00ecnh ch\u1eef nh\u1eadt b\u00e9 c\u0169ng s\u1ebd \u00e1p d\u1ee5ng c\u00f4ng th\u1ee9c S = a x b \u0111\u1ec3 t\u00ecm \u0111\u01b0\u1ee3c \u0111\u00e1p \u00e1n ch\u00ednh x\u00e1c.<\/p>\n<p dir=\"ltr\"><em>V\u00ed d\u1ee5: M\u1ed9t mi\u1ebfng b\u00eca h\u00ecnh ch\u1eef nh\u1eadt c\u00f3 chi\u1ec1u r\u1ed9ng 7 cm chi\u1ec1u d\u00e0i 10 cm. T\u00ednh di\u1ec7n t\u00edch mi\u1ebfng b\u00eca \u0111\u00f3.<\/em><\/p>\n<p dir=\"ltr\"><em>C\u00e1ch gi\u1ea3i: Di\u1ec7n t\u00edch c\u1ee7a mi\u1ebfng b\u00eca l\u00e0: 7 x 10 =70 (cm2)<\/em><\/p>\n<h2 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Bai_tap_toan_lien_quan_toi_hinh_chu_nhat_de_be_luyen_tap\"><\/span>B\u00e0i t\u1eadp to\u00e1n li\u00ean quan t\u1edbi h\u00ecnh ch\u1eef nh\u1eadt \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 l\u00fd thuy\u1ebft tr\u00ean, h\u00e3y c\u00f9ng \u00e1p d\u1ee5ng \u0111\u1ec3 gi\u1ea3i quy\u1ebft m\u1ed9t s\u1ed1 b\u00e0i t\u1eadp sau \u0111\u00e2y nh\u00e9:<\/p>\n<p dir=\"ltr\">B\u00e0i 1: Ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t trong c\u00e1c \u0111\u00e1p \u00e1n sau?<\/p>\n<p dir=\"ltr\">A. H\u00ecnh ch\u1eef nh\u1eadt l\u00e0 t\u1ee9 gi\u00e1c c\u00f3 b\u1ed1n c\u1ea1nh b\u1eb1ng nhau.<\/p>\n<p dir=\"ltr\">B. H\u00ecnh ch\u1eef nh\u1eadt l\u00e0 t\u1ee9 gi\u00e1c c\u00f3 b\u1ed1n g\u00f3c vu\u00f4ng.<\/p>\n<p dir=\"ltr\">C. H\u00ecnh ch\u1eef nh\u1eadt l\u00e0 t\u1ee9 gi\u00e1c c\u00f3 hai g\u00f3c vu\u00f4ng.<\/p>\n<p dir=\"ltr\">D. C\u00e1c ph\u01b0\u01a1ng \u00e1n tr\u00ean \u0111\u1ec1u kh\u00f4ng \u0111\u00fang.<\/p>\n<p dir=\"ltr\">B\u00e0i 2: T\u00ecm c\u00e2u sai trong c\u00e1c c\u00e2u sau<\/p>\n<p dir=\"ltr\">A. Trong h\u00ecnh ch\u1eef nh\u1eadt c\u00f3 hai \u0111\u01b0\u1eddng ch\u00e9o b\u1eb1ng nhau.<\/p>\n<p dir=\"ltr\">B. Trong h\u00ecnh ch\u1eef nh\u1eadt c\u00f3 hai \u0111\u01b0\u1eddng ch\u00e9o c\u1eaft nhau t\u1ea1i trung \u0111i\u1ec3m m\u1ed7i \u0111\u01b0\u1eddng.<\/p>\n<p dir=\"ltr\">C. Trong h\u00ecnh ch\u1eef nh\u1eadt c\u00f3 hai c\u1ea1nh k\u1ec1 b\u1eb1ng nhau.<\/p>\n<p dir=\"ltr\">D. Trong h\u00ecnh ch\u1eef nh\u1eadt, giao c\u1ee7a hai \u0111\u01b0\u1eddng ch\u00e9o l\u00e0 t\u00e2m c\u1ee7a h\u00ecnh ch\u1eef nh\u1eadt \u0111\u00f3<\/p>\n<p dir=\"ltr\">B\u00e0i 3: C\u00e1c d\u1ea5u hi\u1ec7u nh\u1eadn bi\u1ebft sau, d\u1ea5u hi\u1ec7u n\u00e0o nh\u1eadn bi\u1ebft ch\u01b0a \u0111\u00fang?<\/p>\n<p dir=\"ltr\">A. H\u00ecnh b\u00ecnh h\u00e0nh c\u00f3 hai \u0111\u01b0\u1eddng ch\u00e9o c\u1eaft nhau t\u1ea1i trung \u0111i\u1ec3m m\u1ed7i \u0111\u01b0\u1eddng l\u00e0 h\u00ecnh ch\u1eef nh\u1eadt.<\/p>\n<p dir=\"ltr\">B. T\u1ee9 gi\u00e1c c\u00f3 ba g\u00f3c vu\u00f4ng l\u00e0 h\u00ecnh ch\u1eef nh\u1eadt.<\/p>\n<p dir=\"ltr\">C. H\u00ecnh thang c\u00e2n c\u00f3 m\u1ed9t g\u00f3c vu\u00f4ng l\u00e0 h\u00ecnh ch\u1eef nh\u1eadt.<\/p>\n<p dir=\"ltr\">D. H\u00ecnh b\u00ecnh h\u00e0nh c\u00f3 hai \u0111\u01b0\u1eddng ch\u00e9o b\u1eb1ng nhau l\u00e0 h\u00ecnh ch\u1eef nh\u1eadt.<\/p>\n<p dir=\"ltr\">B\u00e0i 4: Khoanh tr\u00f2n v\u00e0o ph\u01b0\u01a1ng \u00e1n sai<\/p>\n<p dir=\"ltr\">A. Trong tam gi\u00e1c vu\u00f4ng \u0111\u01b0\u1eddng trung tuy\u1ebfn \u1ee9ng v\u1edbi c\u1ea1nh huy\u1ec1n v\u00e0 b\u1eb1ng n\u1eeda c\u1ea1nh huy\u1ec1n.<\/p>\n<p dir=\"ltr\">B. Trong tam gi\u00e1c, \u0111\u01b0\u1eddng trung tuy\u1ebfn v\u1edbi v\u1edbi m\u1ed9t c\u1ea1nh v\u00e0 b\u1eb1ng n\u1eeda c\u1ea1nh \u1ea5y th\u00ec tam gi\u00e1c \u0111\u00f3 l\u00e0 tam gi\u00e1c vu\u00f4ng.<\/p>\n<p dir=\"ltr\">C. Trong tam gi\u00e1c vu\u00f4ng, \u0111\u01b0\u1eddng trung tuy\u1ebfn \u1ee9ng v\u1edbi c\u1ea1nh g\u00f3c vu\u00f4ng kh\u00f4ng b\u1eb1ng c\u1ea1nh \u1ea5y.<\/p>\n<p dir=\"ltr\">D. Trong tam gi\u00e1c vu\u00f4ng, \u0111\u01b0\u1eddng trung tuy\u1ebfn \u1ee9ng v\u1edbi c\u1ea1nh huy\u1ec1n th\u00ec vu\u00f4ng g\u00f3c v\u1edbi c\u1ea1nh huy\u1ec1n.<\/p>\n<p dir=\"ltr\">B\u00e0i 5: Trong h\u00ecnh ch\u1eef nh\u1eadt c\u00f3 k\u00edch th\u01b0\u1edbc l\u1ea7n l\u01b0\u1ee3t l\u00e0 5cm v\u00e0 12cm. \u0110\u1ed9 d\u00e0i \u0111\u01b0\u1eddng ch\u00e9o c\u1ee7a h\u00ecnh ch\u1eef nh\u1eadt l\u00e0?<\/p>\n<p dir=\"ltr\">A. 17cm<\/p>\n<p dir=\"ltr\">B. 13cm<\/p>\n<p dir=\"ltr\">C. \u221a 119 cm<\/p>\n<p dir=\"ltr\">D. 12cm<\/p>\n<p dir=\"ltr\">B\u00e0i 6: Di\u1ec7n t\u00edch c\u1ee7a m\u1ed9t h\u00ecnh ch\u1eef nh\u1eadt c\u00f3 chi\u1ec1u d\u00e0i 12cm, chi\u1ec1u r\u1ed9ng 8cm l\u00e0:<\/p>\n<p dir=\"ltr\">B\u00e0i 7: Di\u1ec7n t\u00edch c\u1ee7a h\u00ecnh ch\u1eef nh\u1eadt c\u00f3 chi\u1ec1u d\u00e0i 3dm v\u00e0 chi\u1ec1u r\u1ed9ng 17cm l\u00e0:<\/p>\n<p dir=\"ltr\">B\u00e0i 8: M\u1ed9t m\u1ea3nh v\u01b0\u1eddn h\u00ecnh ch\u1eef nh\u1eadt c\u00f3 chi\u1ec1u d\u00e0i 36cm, chi\u1ec1u r\u1ed9ng b\u1eb1ng 1\/4 chi\u1ec1u d\u00e0i. Di\u1ec7n t\u00edch c\u1ee7a h\u00ecnh ch\u1eef nh\u1eadt l\u00e0:<\/p>\n<p dir=\"ltr\">B\u00e0i 9: M\u1ed9t h\u00ecnh ch\u1eef nh\u1eadt c\u00f3 chi\u1ec1u r\u1ed9ng 12cm v\u00e0 di\u1ec7n t\u00edch b\u1eb1ng 96cm\u00b2. Chi\u1ec1u d\u00e0i c\u1ee7a h\u00ecnh ch\u1eef nh\u1eadt l\u00e0:<\/p>\n<p dir=\"ltr\">B\u00e0i 10: M\u1ed9t m\u1ea3nh \u0111\u1ea5t h\u00ecnh ch\u1eef nh\u1eadt c\u00f3 chi\u1ec1u d\u00e0i 34m, chi\u1ec1u r\u1ed9ng 26m. T\u00ednh chu vi m\u1ea3nh \u0111\u1ea5t \u0111\u00f3.<\/p>\n<p dir=\"ltr\">B\u00e0i 11: M\u1ed9t khung tranh h\u00ecnh ch\u1eef nh\u1eadt c\u00f3 chu vi b\u1eb1ng 8m, chi\u1ec1u d\u00e0i b\u1eb1ng 3m. T\u00ednh chi\u1ec1u r\u1ed9ng c\u1ee7a khung tranh \u0111\u00f3.<\/p>\n<p dir=\"ltr\">B\u00e0i 12: M\u1ed9t s\u00e2n tr\u01b0\u1eddng h\u00ecnh ch\u1eef nh\u1eadt c\u00f3 chu vi b\u1eb1ng 50m, bi\u1ebft chi\u1ec1u d\u00e0i g\u1ea5p 4 l\u1ea7n chi\u1ec1u r\u1ed9ng. T\u00ednh chi\u1ec1u d\u00e0i v\u00e0 chi\u1ec1u r\u1ed9ng s\u00e2n tr\u01b0\u1eddng \u0111\u00f3.<\/p>\n<p dir=\"ltr\">B\u00e0i 13: Cho h\u00ecnh ch\u1eef nh\u1eadt c\u00f3 chi\u1ec1u r\u1ed9ng b\u1eb1ng 7cm v\u00e0 chi\u1ec1u d\u00e0i g\u1ea5p \u0111\u00f4i chi\u1ec1u r\u1ed9ng. T\u00ednh n\u1eeda chu vi h\u00ecnh ch\u1eef nh\u1eadt tr\u00ean.<\/p>\n<p dir=\"ltr\">B\u00e0i 14: M\u1ed9t m\u1ea3nh \u0111\u1ea5t h\u00ecnh ch\u1eef nh\u1eadt c\u00f3 chi\u1ec1u d\u00e0i 35m, chi\u1ec1u r\u1ed9ng 20m. T\u00ednh chu vi m\u1ea3nh \u0111\u1ea5t \u0111\u00f3.<\/p>\n<p dir=\"ltr\">B\u00e0i 15: M\u1ed9t h\u00ecnh ch\u1eef nh\u1eadt c\u00f3 chu vi b\u1eb1ng 160m, chi\u1ec1u d\u00e0i l\u00e0 50m. Chi\u1ec1u r\u1ed9ng h\u00ecnh ch\u1eef nh\u1eadt l\u00e0 bao nhi\u00eau?\u00a0<\/p>\n<h2 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Bi_quyet_giup_be_hoc_ghi_nho_kien_thuc_hinh_chu_nhat_hieu_qua\"><\/span>B\u00ed quy\u1ebft gi\u00fap b\u00e9 h\u1ecdc, ghi nh\u1edb ki\u1ebfn th\u1ee9c h\u00ecnh ch\u1eef nh\u1eadt hi\u1ec7u qu\u1ea3<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p dir=\"ltr\">Ki\u1ebfn th\u1ee9c v\u1ec1 h\u00ecnh ch\u1eef nh\u1eadt v\u1edbi c\u00e1c b\u00e9 h\u1ecdc ti\u1ec3u h\u1ecdc ch\u1eef th\u1ef1c s\u1ef1 qu\u00e1 kh\u00f3 hay c\u00f3 nhi\u1ec1u b\u00e0i t\u1eadp ph\u1ee9c t\u1ea1p, nh\u01b0ng \u0111\u00f3 l\u00e0 n\u1ec1n t\u1ea3ng quan tr\u1ecdng. V\u1eady n\u00ean, \u0111\u1ec3 gi\u00fap con c\u00f3 th\u1ec3 h\u1ecdc v\u1eefng \u0111\u01b0\u1ee3c ki\u1ebfn th\u1ee9c n\u00e0y, b\u1ed1 m\u1eb9 \u0111\u1eebng b\u1ecf qua nh\u1eefng b\u00ed quy\u1ebft sau \u0111\u00e2y:<\/p>\n<h3 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Tao_su_hung_thu_va_niem_dam_me_hoc_toan_cho_tre_voi_Shining_Home_%E2%80%93_Gia_dinh_Anh_Ngu_Math\"><\/span>T\u1ea1o s\u1ef1 h\u1ee9ng th\u00fa v\u00e0 ni\u1ec1m \u0111am m\u00ea h\u1ecdc to\u00e1n cho tr\u1ebb v\u1edbi Shining Home &#8211; Gia \u0111\u00ecnh Anh Ng\u1eef Math<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p dir=\"ltr\">V\u1edbi tr\u1ebb em, mu\u1ed1n h\u1ecdc to\u00e1n hi\u1ec7u qu\u1ea3 c\u1ea7n ph\u1ea3i t\u1ea1o s\u1ef1 h\u1ee9ng th\u00fa v\u00e0 ni\u1ec1m \u0111am m\u00ea \u1edf tr\u1ebb. Tuy nhi\u00ean, nhi\u1ec1u b\u1ed1 m\u1eb9 hi\u1ec7n nay th\u01b0\u1eddng \u00e1p d\u1ee5ng c\u00e1ch d\u1ea1y h\u1ecdc truy\u1ec1n th\u1ed1ng, kh\u00f4ng t\u1ea1o \u0111\u01b0\u1ee3c s\u1ef1 h\u1ee9ng th\u00fa th\u1eadm ch\u00ed c\u00f2n t\u1ea1o \u00e1p l\u1ef1c v\u00e0 s\u1ee3 h\u1ecdc to\u00e1n c\u1ee7a b\u00e9 cao h\u01a1n.<\/p>\n<p dir=\"ltr\">V\u1eady n\u00ean, \u0111\u1ec3 gi\u00fap qu\u00e1 tr\u00ecnh h\u1ecdc to\u00e1n c\u1ee7a b\u00e9 hi\u1ec7u qu\u1ea3 h\u01a1n, b\u1ed1 m\u1eb9 c\u00f3 th\u1ec3 l\u1ef1a ch\u1ecdn Shining Home &#8211; Gia \u0111\u00ecnh Anh Ng\u1eef Math \u0111\u1ec3 \u0111\u1ed3ng h\u00e0nh c\u00f9ng v\u1edbi b\u00e9. \u0110\u00e2y l\u00e0 \u1ee9ng d\u1ee5ng d\u1ea1y h\u1ecdc to\u00e1n ti\u1ebfng Anh h\u00e0ng \u0111\u1ea7u Vi\u1ec7t Nam, \u0111\u01b0\u1ee3c bi\u00ean so\u1ea1n d\u1ef1a tr\u00ean ti\u00eau chu\u1ea9n Ti\u00eau chu\u1ea9n Common Core State Standards c\u1ee7a M\u1ef9 cung c\u1ea5p tr\u00ean 45 chuy\u00ean \u0111\u1ec1 To\u00e1n h\u1ecdc thu\u1ed9c c\u00e1c l\u0129nh v\u1ef1c S\u1ed1, Ph\u00e9p t\u00ednh v\u00e0 t\u01b0 duy \u0111\u1ea1i s\u1ed1, \u0110o l\u01b0\u1eddng, H\u00ecnh h\u1ecdc, Th\u1ed1ng k\u00ea v\u00e0 bi\u1ec3u \u0111\u1ed3.<\/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\/hinh-chu-nhat-11.jpg\" alt=\"N\u00e2ng cao hi\u1ec7u qu\u1ea3 h\u1ecdc to\u00e1n c\u00f9ng Shining Home - Gia \u0111\u00ecnh Anh Ng\u1eef Math. (\u1ea2nh: monkey)\" width=\"100%\"><\/p>\n<p dir=\"ltr\">\u0110\u1ed3ng th\u1eddi, th\u00f4ng qua \u1ee9ng d\u1ee5ng Shining Home &#8211; Gia \u0111\u00ecnh Anh Ng\u1eef Math, b\u00e9 kh\u00f4ng ch\u1ec9 \u0111\u01a1n thu\u1ea7n l\u00e0 h\u1ecdc ki\u1ebfn th\u1ee9c m\u00e0 c\u00f2n \u0111\u01b0\u1ee3c t\u01b0\u01a1ng t\u00e1c, tr\u1ea3i nghi\u1ec7m, kh\u00e1m ph\u00e1, vui ch\u01a1i c\u00f9ng to\u00e1n h\u1ecdc v\u1edbi h\u01a1n 10.000 ho\u1ea1t \u0111\u1ed9ng t\u01b0\u01a1ng t\u00e1c. \u0110\u1ec3 qua \u0111\u00f3 s\u1ebd gi\u00fap b\u00e9 gia t\u0103ng s\u1ef1 h\u1ee9ng th\u00fa khi h\u1ecdc to\u00e1n h\u01a1n thay v\u00ec ch\u1ec9 h\u1ecdc tr\u00ean s\u00e1ch v\u1edf, r\u00e8n luy\u1ec7n tinh th\u1ea7n t\u1ef1 h\u1ecdc cao h\u01a1n v\u00e0 quan tr\u1ecdng s\u1ebd gi\u00fap h\u00ecnh th\u00e0nh t\u01b0 duy s\u00e1ng t\u1ea1o khi h\u1ecdc to\u00e1n v\u00e0 h\u1ecdc ngo\u1ea1i ng\u1eef m\u1ed9t c\u00e1ch t\u1ed1t 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=\"Dam_bao_be_nam_vung_kien_thuc_co_ban_ve_hinh_chu_nhat\"><\/span>\u0110\u1ea3m b\u1ea3o b\u00e9 n\u1eafm v\u1eefng ki\u1ebfn th\u1ee9c c\u01a1 b\u1ea3n v\u1ec1 h\u00ecnh ch\u1eef nh\u1eadt<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p dir=\"ltr\">\u0110\u1ec3 gi\u1ea3i \u0111\u01b0\u1ee3c b\u00e0i t\u1eadp v\u1ec1 h\u00ecnh ch\u1eef nh\u1eadt, \u0111\u00f2i h\u1ecfi b\u00e9 ph\u1ea3i n\u1eafm v\u1eefng \u0111\u01b0\u1ee3c ki\u1ebfn th\u1ee9c c\u01a1 b\u1ea3n li\u00ean quan \u0111\u1ebfn h\u00ecnh h\u1ecdc n\u00e0y, \u0111i\u1ec3n h\u00ecnh nh\u01b0 \u0111\u1ecbnh ngh\u0129a, t\u00ednh ch\u1ea5t, d\u1ea5u hi\u1ec7u nh\u1eadn bi\u1ebft, c\u00f4ng th\u1ee9c t\u00ednh chu vi, di\u1ec7n t\u00edch, c\u00e1c d\u1ea1ng b\u00e0i t\u1eadp\u2026.<\/p>\n<p dir=\"ltr\">B\u1edfi v\u00ec khi khi b\u00e9 n\u1eafm \u0111\u01b0\u1ee3c ki\u1ebfn th\u1ee9c c\u01a1 b\u1ea3n n\u00e0y m\u1edbi th\u1ef1c s\u1ef1 gi\u1ea3i \u0111\u01b0\u1ee3c b\u00e0i t\u1eadp m\u1ed9t c\u00e1ch ch\u00ednh x\u00e1c nh\u1ea5t. V\u1eady n\u00ean, b\u1ed1 m\u1eb9 c\u1ea7n ki\u1ec3m tra ki\u1ebfn th\u1ee9c b\u00e9 th\u01b0\u1eddng xuy\u00ean, \u0111\u1ec3 tr\u00e1nh b\u00e9 b\u1ecb qu\u00ean c\u0169ng nh\u01b0 c\u1ee7ng c\u1ed1 l\u1ea1i ki\u1ebfn th\u1ee9c k\u1ecbp th\u1eddi cho tr\u1ebb.<\/p>\n<h3 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Cung_be_luyen_tap_thuc_hanh_thuong_xuyen\"><\/span>C\u00f9ng b\u00e9 luy\u1ec7n t\u1eadp, th\u1ef1c h\u00e0nh th\u01b0\u1eddng xuy\u00ean<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p dir=\"ltr\">Khi con \u0111\u00e3 n\u1eafm ch\u1eafc \u0111\u01b0\u1ee3c ki\u1ebfn th\u1ee9c, l\u00fd thuy\u1ebft th\u00ec b\u1ed1 m\u1eb9 h\u00e3y t\u1ea1o \u0111i\u1ec1u ki\u1ec7n \u0111\u1ec3 con \u0111\u01b0\u1ee3c th\u1ef1c h\u00e0nh, luy\u1ec7n t\u1eadp th\u01b0\u1eddng xuy\u00ean. Vi\u1ec7c \u0111\u01b0\u1ee3c th\u1ef1c h\u00e0nh li\u00ean t\u1ee5c s\u1ebd gi\u00fap b\u00e9 hi\u1ec3u r\u00f5 ki\u1ebfn th\u1ee9c m\u00e0 m\u00ecnh h\u1ecdc, ghi nh\u1edb t\u1ed1t h\u01a1n, t\u1ea1o s\u1ef1 h\u1ee9ng th\u00fa khi h\u1ecdc t\u1eadp v\u00e0 d\u1ec5 d\u00e0ng \u00e1p d\u1ee5ng t\u1eeb l\u00fd thuy\u1ebft v\u00e0o gi\u1ea3i b\u00e0i t\u1eadp\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\/hinh-chu-nhat-12.jpg\" alt=\"C\u00f9ng b\u00e9 luy\u1ec7n t\u1eadp nhi\u1ec1u h\u01a1n. (\u1ea2nh: S\u01b0u t\u1ea7m internet)\" width=\"100%\"><\/p>\n<p dir=\"ltr\">V\u1eady n\u00ean, vi\u1ec7c th\u1ef1c h\u00e0nh \u1edf \u0111\u00e2y m\u00e0 b\u1ed1 m\u1eb9 c\u00f3 th\u1ec3 c\u00f9ng b\u00e9 l\u00e0m \u0111\u00f3 ch\u00ednh l\u00e0 gi\u1ea3i nhi\u1ec1u b\u00e0i t\u1eadp v\u1ec1 h\u00ecnh ch\u1eef nh\u1eadt, l\u1ea5y v\u00ed d\u1ee5 li\u00ean quan t\u1edbi th\u1ef1c ti\u1ec5n, gi\u1ea3i \u0111\u1ec1 thi v\u1ec1 h\u00ecnh h\u1ecdc, th\u1ef1c hi\u1ec7n c\u00e1c ho\u1ea1t \u0111\u1ed9ng t\u01b0\u01a1ng t\u00e1c c\u00f9ng Shining Home &#8211; Gia \u0111\u00ecnh Anh Ng\u1eef Math,\u2026<\/p>\n<h3 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Yeu_cau_be_doc_va_hieu_de_bai_tap\"><\/span>Y\u00eau c\u1ea7u b\u00e9 \u0111\u1ecdc v\u00e0 hi\u1ec3u \u0111\u1ec1 b\u00e0i t\u1eadp<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p dir=\"ltr\">M\u1ed9t trong nh\u1eefng y\u1ebfu t\u1ed1 quan tr\u1ecdng khi l\u00e0m b\u00e0i t\u1eadp to\u00e1n ch\u00ednh l\u00e0 \u0111\u1ecdc k\u1ef9 \u0111\u1ec1 b\u00e0i. Ch\u00ednh v\u00ec v\u1eady, b\u1ed1 m\u1eb9 n\u00ean y\u00eau c\u1ea7u b\u00e9 \u0111\u1ecdc v\u00e0 hi\u1ec3u \u0111\u1ec1 b\u00e0i cho nh\u1eefng d\u1eef ki\u1ec7n n\u00e0o, c\u00e2u h\u1ecfi l\u00e0 g\u00ec \u0111\u1ec3 t\u1eeb \u0111\u00f3 m\u1edbi ti\u1ebfn h\u00e0nh \u0111\u01b0a ra ph\u01b0\u01a1ng \u00e1n gi\u1ea3i v\u00e0 x\u1eed l\u00fd ch\u00ednh x\u00e1c.<\/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 ki\u1ebfn th\u1ee9c c\u01a1 b\u1ea3n v\u1ec1 h\u00ecnh ch\u1eef nh\u1eadt. M\u1eb7c d\u00f9 l\u00e0 c\u01a1 b\u1ea3n nh\u01b0ng ch\u00ednh l\u00e0 n\u1ec1n t\u1ea3ng quan tr\u1ecdng \u0111\u1ec3 h\u1ecdc c\u00e1c ki\u1ebfn th\u1ee9c kh\u00f3 h\u01a1n sau n\u00e0y. Ch\u00ednh v\u00ec v\u1eady, b\u1ed1 m\u1eb9 h\u00e3y h\u01b0\u1edbng d\u1eabn v\u00e0 \u0111\u1ed3ng h\u00e0nh c\u00f9ng b\u00e9 h\u1ecdc t\u1eadp \u0111\u1ec3 \u0111\u1ea1t \u0111\u01b0\u1ee3c k\u1ebft qu\u1ea3 t\u1ed1t nh\u1ea5t nh\u00e9.<\/p>\n<p>                                    Ngu\u1ed3n tham kh\u1ea3o<\/p>\n<p>Rectangle<\/p>\n<p>https:\/\/byjus.com\/maths\/rectangle\/<\/p>\n<p>Rectangle \u2013 Definition with Examples<\/p>\n<blockquote class=\"wp-embedded-content\" data-secret=\"YPqpxBpaJ5\"><p><a href=\"https:\/\/www.splashlearn.com\/math-vocabulary\/difference-between-square-and-rectangle\/rectangle\/#main\" target=\"_blank\" rel=\"noopener\">Rectangle ABCD<\/a><\/p><\/blockquote>\n<p><iframe loading=\"lazy\" class=\"wp-embedded-content\" sandbox=\"allow-scripts\" security=\"restricted\" style=\"position: absolute; visibility: hidden;\" title=\"&#8220;Rectangle ABCD&#8221; &#8212; SplashLearn\" src=\"https:\/\/www.splashlearn.com\/math-vocabulary\/difference-between-square-and-rectangle\/rectangle\/#main\/embed\/#?secret=oEZBY3VE73#?secret=YPqpxBpaJ5\" data-secret=\"YPqpxBpaJ5\" width=\"600\" height=\"338\" frameborder=\"0\" marginwidth=\"0\" marginheight=\"0\" scrolling=\"no\"><\/iframe><\/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>H\u00ecnh ch\u1eef nh\u1eadt thu\u1ed9c h\u00ecnh t\u1ee9 gi\u00e1c \u0111\u1eb7c bi\u1ec7t, c\u0169ng nh\u01b0 l\u00e0 m\u1ed9t lo\u1ea1i h\u00ecnh h\u1ecdc c\u01a1 b\u1ea3n v\u00e0 ph\u1ed5 bi\u1ebfn hi\u1ec7n nay. \u0110\u1ec3 c\u00f3 th\u1ec3 hi\u1ec3u r\u00f5 h\u01a1n v\u1ec1 ki\u1ebfn th\u1ee9c c\u1ee7a h\u00ecnh h\u1ecdc n\u00e0y, h\u00e3y c\u00f9ng Shining Home &#8211; Gia \u0111\u00ecnh Anh Ng\u1eef tham kh\u1ea3o chi ti\u1ebft trong b\u00e0i vi\u1ebft sau \u0111\u00e2y nh\u00e9&#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-17980","post","type-post","status-publish","format-standard","hentry","category-kien-thuc"],"_links":{"self":[{"href":"https:\/\/www.ckconitsha.com\/vn\/wp-json\/wp\/v2\/posts\/17980","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=17980"}],"version-history":[{"count":2,"href":"https:\/\/www.ckconitsha.com\/vn\/wp-json\/wp\/v2\/posts\/17980\/revisions"}],"predecessor-version":[{"id":23591,"href":"https:\/\/www.ckconitsha.com\/vn\/wp-json\/wp\/v2\/posts\/17980\/revisions\/23591"}],"wp:attachment":[{"href":"https:\/\/www.ckconitsha.com\/vn\/wp-json\/wp\/v2\/media?parent=17980"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ckconitsha.com\/vn\/wp-json\/wp\/v2\/categories?post=17980"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ckconitsha.com\/vn\/wp-json\/wp\/v2\/tags?post=17980"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}