{"id":14019,"date":"2025-06-06T03:51:53","date_gmt":"2025-06-05T20:51:53","guid":{"rendered":"https:\/\/www.ckconitsha.com\/vn\/?p=14019"},"modified":"2025-07-03T23:00:05","modified_gmt":"2025-07-03T16:00:05","slug":"cong-thuc-tinh-chu-vi-hinh-tu-giac-day-du-chinh-xac-nhat","status":"publish","type":"post","link":"https:\/\/www.ckconitsha.com\/vn\/cong-thuc-tinh-chu-vi-hinh-tu-giac-day-du-chinh-xac-nhat\/","title":{"rendered":"C\u00f4ng th\u1ee9c t\u00ednh chu vi h\u00ecnh t\u1ee9 gi\u00e1c \u0111\u1ea7y \u0111\u1ee7 ch\u00ednh x\u00e1c 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\/cong-thuc-tinh-chu-vi-hinh-tu-giac-day-du-chinh-xac-nhat\/#Cong_thuc_tinh_toan_chu_vi_cua_tu_giac_la_gi\" >C\u00f4ng th\u1ee9c t\u00ednh to\u00e1n chu vi c\u1ee7a t\u1ee9 gi\u00e1c l\u00e0 g\u00ec?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.ckconitsha.com\/vn\/cong-thuc-tinh-chu-vi-hinh-tu-giac-day-du-chinh-xac-nhat\/#Cach_tinh_chu_vi_cua_tu_giac\" >C\u00e1ch t\u00ednh chu vi c\u1ee7a t\u1ee9 gi\u00e1c<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.ckconitsha.com\/vn\/cong-thuc-tinh-chu-vi-hinh-tu-giac-day-du-chinh-xac-nhat\/#Cong_thuc_tinh_toan_chu_vi_cua_tu_giac\" >C\u00f4ng th\u1ee9c t\u00ednh to\u00e1n chu vi c\u1ee7a t\u1ee9 gi\u00e1c<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.ckconitsha.com\/vn\/cong-thuc-tinh-chu-vi-hinh-tu-giac-day-du-chinh-xac-nhat\/#Cong_thuc_chu_vi_tu_giac_dac_biet\" >C\u00f4ng th\u1ee9c chu vi t\u1ee9 gi\u00e1c \u0111\u1eb7c bi\u1ec7t<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.ckconitsha.com\/vn\/cong-thuc-tinh-chu-vi-hinh-tu-giac-day-du-chinh-xac-nhat\/#Vi_du_lam_the_nao_de_tinh_chu_vi_cua_tu_giac_toan_hoc_3_va_4\" >V\u00ed d\u1ee5: l\u00e0m th\u1ebf n\u00e0o \u0111\u1ec3 t\u00ednh chu vi c\u1ee7a t\u1ee9 gi\u00e1c to\u00e1n h\u1ecdc 3 v\u00e0 4<\/a><\/li><\/ul><\/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\/cong-thuc-tinh-chu-vi-hinh-tu-giac-day-du-chinh-xac-nhat\/#Cac_loai_chu_vi_tu_giac\" >C\u00e1c lo\u1ea1i chu vi t\u1ee9 gi\u00e1c<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/www.ckconitsha.com\/vn\/cong-thuc-tinh-chu-vi-hinh-tu-giac-day-du-chinh-xac-nhat\/#Mau_1_Tinh_chu_vi_cua_tu_giac_khi_biet_do_dai_cua_cac_canh\" >M\u1eabu 1: T\u00ednh chu vi c\u1ee7a t\u1ee9 gi\u00e1c khi bi\u1ebft \u0111\u1ed9 d\u00e0i c\u1ee7a c\u00e1c c\u1ea1nh<\/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\/cong-thuc-tinh-chu-vi-hinh-tu-giac-day-du-chinh-xac-nhat\/#Mau_2_Cho_chu_vi_tim_do_dai_canh\" >M\u1eabu 2: Cho chu vi, t\u00ecm \u0111\u1ed9 d\u00e0i c\u1ea1nh<\/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\/cong-thuc-tinh-chu-vi-hinh-tu-giac-day-du-chinh-xac-nhat\/#Mau_3_chu_vi_tu_giac_dac_biet\" >M\u1eabu 3: chu vi t\u1ee9 gi\u00e1c \u0111\u1eb7c bi\u1ec7t<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/www.ckconitsha.com\/vn\/cong-thuc-tinh-chu-vi-hinh-tu-giac-day-du-chinh-xac-nhat\/#Thuc_hanh_cach_tinh_chu_vi_cua_tu_giac_toan_hoc_3_va_4\" >Th\u1ef1c h\u00e0nh c\u00e1ch t\u00ednh chu vi c\u1ee7a t\u1ee9 gi\u00e1c to\u00e1n h\u1ecdc 3 v\u00e0 4<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/www.ckconitsha.com\/vn\/cong-thuc-tinh-chu-vi-hinh-tu-giac-day-du-chinh-xac-nhat\/#Bi_quyet_de_giup_be_ghi_nho_cach_tinh_chu_vi_cua_tu_giac_mot_cach_hieu_qua\" >B\u00ed quy\u1ebft \u0111\u1ec3 gi\u00fap b\u00e9 ghi nh\u1edb c\u00e1ch t\u00ednh chu vi c\u1ee7a t\u1ee9 gi\u00e1c m\u1ed9t c\u00e1ch 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-12\" href=\"https:\/\/www.ckconitsha.com\/vn\/cong-thuc-tinh-chu-vi-hinh-tu-giac-day-du-chinh-xac-nhat\/#Tao_su_phan_khich_khi_hoc_toan_cho_tre_em_voi_toan_hoc_khi\" >T\u1ea1o s\u1ef1 ph\u1ea5n kh\u00edch khi h\u1ecdc to\u00e1n cho tr\u1ebb em v\u1edbi to\u00e1n h\u1ecdc kh\u1ec9<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/www.ckconitsha.com\/vn\/cong-thuc-tinh-chu-vi-hinh-tu-giac-day-du-chinh-xac-nhat\/#Hay_chac_chan_rang_em_be_cua_ban_lam_chu_kien_%E2%80%8B%E2%80%8Bthuc_co_ban_ve_chu_vi_tu_giac\" >H\u00e3y ch\u1eafc ch\u1eafn r\u1eb1ng em b\u00e9 c\u1ee7a b\u1ea1n l\u00e0m ch\u1ee7 ki\u1ebfn \u200b\u200bth\u1ee9c c\u01a1 b\u1ea3n v\u1ec1 chu vi t\u1ee9 gi\u00e1c<\/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\/cong-thuc-tinh-chu-vi-hinh-tu-giac-day-du-chinh-xac-nhat\/#Voi_em_be_cua_ban_de_luyen_tap_thuc_hanh_nhieu_hon\" >V\u1edbi em b\u00e9 c\u1ee7a b\u1ea1n \u0111\u1ec3 luy\u1ec7n t\u1eadp, th\u1ef1c h\u00e0nh nhi\u1ec1u h\u01a1n<\/a><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<\/p>\n<p>Chu vi c\u1ee7a t\u1ee9 gi\u00e1c l\u00e0 m\u1ed9t ki\u1ebfn \u200b\u200bth\u1ee9c kh\u00e1 r\u1ed9ng, b\u1edfi v\u00ec h\u00ecnh h\u1ecdc n\u00e0y c\u00f3 nhi\u1ec1u th\u1ec3 lo\u1ea1i kh\u00e1c nhau, c\u00f4ng th\u1ee9c c\u0169ng r\u1ea5t \u0111a d\u1ea1ng. Do \u0111\u00f3, \u0111\u1ec3 gi\u00fap h\u1ecd hi\u1ec3u \u0111\u1ea7y \u0111\u1ee7 v\u00e0 ch\u00ednh x\u00e1c chu vi c\u1ee7a c\u00e1c lo\u1ea1i t\u1ee9 gi\u00e1c, h\u00e3y \u0111\u1ec3 kh\u1ec9 ngay l\u1eadp t\u1ee9c \u0111\u1ec1 c\u1eadp \u0111\u1ebfn b\u00e0i vi\u1ebft sau.<\/p>\n<p>                        Xem t\u1ea5t c\u1ea3<\/p>\n<h2 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Cong_thuc_tinh_toan_chu_vi_cua_tu_giac_la_gi\"><\/span>C\u00f4ng th\u1ee9c t\u00ednh to\u00e1n chu vi c\u1ee7a t\u1ee9 gi\u00e1c l\u00e0 g\u00ec?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p dir=\"ltr\">Vi\u1ec7c t\u00ednh to\u00e1n b\u1ea5t k\u1ef3 chu vi t\u1ee9 gi\u00e1c b\u1eb1ng t\u1ed5ng chi\u1ec1u d\u00e0i c\u1ee7a n\u00f3 l\u00e0 b\u1ed1n c\u1ea1nh. \u0110\u1ec3 t\u00ednh chu vi c\u1ee7a t\u1ee9 gi\u00e1c, b\u1ea1n ch\u1ec9 c\u1ea7n th\u00eam t\u1ed5ng chi\u1ec1u d\u00e0i c\u1ee7a c\u1ea3 4 c\u1ea1nh v\u1edbi nhau. <\/p>\n<p dir=\"ltr\">V\u00ed d\u1ee5, n\u1ebfu m\u1ed9t h\u00ecnh t\u1ee9 gi\u00e1c c\u00f3 chi\u1ec1u d\u00e0i c\u1ee7a c\u00e1c c\u1ea1nh A, B, C v\u00e0 D, th\u00ec chu vi c\u1ee7a t\u1ee9 gi\u00e1c \u0111\u00f3 s\u1ebd l\u00e0 (A + B + C + D).<\/p>\n<p dir=\"ltr\">Ghi ch\u00fa: <em>C\u00f4ng th\u1ee9c n\u00e0y \u00e1p d\u1ee5ng cho t\u1ea5t c\u1ea3 c\u00e1c lo\u1ea1i h\u00ecnh t\u1ee9 gi\u00e1c, b\u1ea5t k\u1ec3 c\u00e1c c\u1ea1nh c\u00f3 b\u1eb1ng nhau hay kh\u00f4ng. N\u00f3i c\u00e1ch kh\u00e1c, kh\u00f4ng c\u1ea7n thi\u1ebft ph\u1ea3i bi\u1ebft h\u00ecnh t\u1ee9 gi\u00e1c l\u00e0 h\u00ecnh vu\u00f4ng, h\u00ecnh ch\u1eef nh\u1eadt ho\u1eb7c tam gi\u00e1c \u0111\u1ec1u, ch\u1ec9 c\u1ea7n bi\u1ebft chi\u1ec1u d\u00e0i c\u1ee7a c\u1ea3 b\u1ed1n c\u1ea1nh l\u00e0 \u0111\u1ee7 \u0111\u1ec3 t\u00ednh chu vi.<\/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\/chu-vi-hinh-tu-giac-1.jpg\" alt=\"T\u00ednh chu vi c\u1ee7a t\u1ee9 gi\u00e1c d\u1ef1a tr\u00ean t\u1ed5ng c\u1ee7a c\u00e1c c\u1ea1nh. (\u1ea2nh: B\u1ed9 s\u01b0u t\u1eadp Internet)\" width=\"100%\"><\/p>\n<h2 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Cach_tinh_chu_vi_cua_tu_giac\"><\/span>C\u00e1ch t\u00ednh chu vi c\u1ee7a t\u1ee9 gi\u00e1c <span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p dir=\"ltr\">T\u1ee9 gi\u00e1c c\u00f3 2 d\u1ea1ng: t\u1ee9 gi\u00e1c th\u00f4ng th\u01b0\u1eddng v\u00e0 t\u1ee9 gi\u00e1c \u0111\u1eb7c bi\u1ec7t. Sau \u0111\u00e2y l\u00e0 c\u00f4ng th\u1ee9c cho chu vi c\u1ee7a t\u1ee9 gi\u00e1c kh\u00e1c nhau.<\/p>\n<h3 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Cong_thuc_tinh_toan_chu_vi_cua_tu_giac\"><\/span>C\u00f4ng th\u1ee9c t\u00ednh to\u00e1n chu vi c\u1ee7a t\u1ee9 gi\u00e1c<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p dir=\"ltr\">V\u1edbi m\u1ed9t h\u00ecnh t\u1ee9 gi\u00e1c, chu vi s\u1ebd b\u1eb1ng t\u1ed5ng chi\u1ec1u d\u00e0i c\u1ee7a 4 c\u1ea1nh, \u0111\u00f3 l\u00e0: P = A + B + C + D (\u0110\u01a1n v\u1ecb t\u00ednh to\u00e1n) <\/p>\n<p dir=\"ltr\">Trong \u0111\u00f3:<\/p>\n<ul>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">P: chu vi c\u1ee7a t\u1ee9 gi\u00e1c<\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">A, B, C, D: Chi\u1ec1u d\u00e0i c\u1ee7a 4 c\u1ea1nh c\u1ee7a t\u1ee9 gi\u00e1c.<\/p>\n<\/li>\n<\/ul>\n<p dir=\"ltr\"><em>V\u00ed d\u1ee5: ABCD t\u1ee9 gi\u00e1c \u0111\u00e3 cho chi\u1ec1u d\u00e0i 4 c\u1ea1nh AB = 3cm, BC = 5cm, CD = 4 cm, AD = 6cm.<\/em><\/p>\n<p dir=\"ltr\"><em>Chu vi c\u1ee7a ABCD t\u1ee9 gi\u00e1c:<\/em><\/p>\n<p dir=\"ltr\"><em>P = 3 + 5 + 4 + 6 = 18 (cm)<\/em><\/p>\n<h3 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Cong_thuc_chu_vi_tu_giac_dac_biet\"><\/span>C\u00f4ng th\u1ee9c chu vi t\u1ee9 gi\u00e1c \u0111\u1eb7c bi\u1ec7t<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p dir=\"ltr\">V\u1edbi m\u1ed9t t\u1ee9 gi\u00e1c \u0111\u1eb7c bi\u1ec7t bao g\u1ed3m c\u00e1c h\u00ecnh d\u1ea1ng: h\u00ecnh vu\u00f4ng, h\u00ecnh thoi, h\u00ecnh ch\u1eef nh\u1eadt, h\u00ecnh b\u00ecnh h\u00e0nh, h\u00ecnh thang. V\u1ec1 chu vi c\u1ee7a nh\u1eefng h\u00ecnh \u1ea3nh n\u00e0y kh\u00e1 \u0111\u01a1n gi\u1ea3n nh\u01b0 sau:<\/p>\n<ul>\n<li dir=\"ltr\">Chu vi h\u00ecnh thang c\u1ee7a 4 c\u1ea1nh l\u00e0 a, b, c, d l\u00e0: p = a + b + c + d<\/li>\n<li dir=\"ltr\">Chu vi c\u1ee7a h\u00ecnh b\u00ecnh h\u00e0nh, h\u00ecnh ch\u1eef nh\u1eadt l\u00e0: p = 2. (A + b)<\/li>\n<li dir=\"ltr\">Chu vi c\u1ee7a h\u00ecnh vu\u00f4ng, kim c\u01b0\u01a1ng l\u00e0: p = 4.a<\/li>\n<\/ul>\n<p dir=\"ltr\">Trong \u0111\u00f3:<\/p>\n<ul>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">P: chu vi t\u1ee9 gi\u00e1c \u0111\u1eb7c bi\u1ec7t<\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">A, B, C, D: chi\u1ec1u d\u00e0i c\u1ea1nh c\u1ee7a t\u1ee9 gi\u00e1c<\/p>\n<\/li>\n<\/ul>\n<h3><span class=\"ez-toc-section\" id=\"Vi_du_lam_the_nao_de_tinh_chu_vi_cua_tu_giac_toan_hoc_3_va_4\"><\/span>V\u00ed d\u1ee5: l\u00e0m th\u1ebf n\u00e0o \u0111\u1ec3 t\u00ednh chu vi c\u1ee7a t\u1ee9 gi\u00e1c to\u00e1n h\u1ecdc 3 v\u00e0 4<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><a href=\"https:\/\/www.youtube.com\/watch?v=rb59fjwythi\" target=\"_blank\" rel=\"noopener\">https:\/\/www.youtube.com\/watch?v=rb59fjwythi<\/a><\/p>\n<p>Xem th\u00eam: C\u00f4ng th\u1ee9c t\u1ed5ng h\u1ee3p ho\u00e0n ch\u1ec9nh cho chu vi c\u1ee7a h\u00ecnh h\u1ecdc chi ti\u1ebft nh\u1ea5t<\/p>\n<h2 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Cac_loai_chu_vi_tu_giac\"><\/span>C\u00e1c lo\u1ea1i chu vi t\u1ee9 gi\u00e1c<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p dir=\"ltr\">\u0110\u1ed1i v\u1edbi tr\u1ebb em l\u1edbp 1, th\u00f4ng th\u01b0\u1eddng ki\u1ebfn \u200b\u200bth\u1ee9c ch\u1ec9 \u1edf d\u1ea1ng c\u01a1 b\u1ea3n. V\u00ec v\u1eady, \u0111\u1ed1i v\u1edbi t\u00ednh to\u00e1n chu vi c\u1ee7a t\u1ee9 gi\u00e1c, s\u1ebd c\u00f3 c\u00e1c lo\u1ea1i b\u00e0i t\u1eadp 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\/chu-vi-hinh-tu-giac-3.jpg\" alt=\"C\u00f3 nhi\u1ec1u lo\u1ea1i b\u00e0i t\u1eadp tr\u00ean chu vi c\u1ee7a t\u1ee9 gi\u00e1c. (\u1ea2nh: B\u1ed9 s\u01b0u t\u1eadp Internet)\" width=\"100%\"><\/p>\n<h3 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Mau_1_Tinh_chu_vi_cua_tu_giac_khi_biet_do_dai_cua_cac_canh\"><\/span>M\u1eabu 1: T\u00ednh chu vi c\u1ee7a t\u1ee9 gi\u00e1c khi bi\u1ebft \u0111\u1ed9 d\u00e0i c\u1ee7a c\u00e1c c\u1ea1nh<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p dir=\"ltr\">\u0110\u00e2y l\u00e0 h\u00ecnh th\u1ee9c t\u1eadp th\u1ec3 d\u1ee5c c\u01a1 b\u1ea3n nh\u1ea5t, khi v\u1ea5n \u0111\u1ec1 s\u1ebd cung c\u1ea5p th\u00f4ng tin d\u1eef li\u1ec7u v\u1ec1 \u0111\u1ed9 d\u00e0i c\u1ee7a c\u00e1c c\u1ea1nh t\u1ee9 gi\u00e1c v\u00e0 y\u00eau c\u1ea7u em b\u00e9 t\u00ednh to\u00e1n chu vi t\u01b0\u01a1ng \u1ee9ng. V\u00ec v\u1eady, h\u1ecd ch\u1ec9 c\u1ea7n \u00e1p d\u1ee5ng c\u00f4ng th\u1ee9c chu vi P = A + B + C + D \u0111\u1ec3 t\u00ednh to\u00e1n ch\u00ednh x\u00e1c.<\/p>\n<p dir=\"ltr\"><em>V\u00ed d\u1ee5: T\u00ednh chu vi c\u1ee7a t\u1ee9 gi\u00e1c v\u1edbi c\u00e1c m\u1eb7t sau:<\/em><\/p>\n<p dir=\"ltr\"><em>5dm, 3dm, 6dm, 4dm<\/em><\/p>\n<p dir=\"ltr\"><em>3cm, 5cm, 4cm, 3,5cm<\/em><\/p>\n<p dir=\"ltr\"><em>Ph\u1ea7n th\u01b0\u1edfng:<\/em><\/p>\n<p dir=\"ltr\"><em>\u00c1p d\u1ee5ng c\u00f4ng th\u1ee9c chu vi m\u00e0 ch\u00fang t\u00f4i c\u00f3:<\/em><\/p>\n<p dir=\"ltr\"><em>P = 5 + 3 + 6 + 4 = 18dm<\/em><\/p>\n<p dir=\"ltr\"><em>P = 3 + 5 + 4 + 3.5 = 15,5cm<\/em><\/p>\n<h3 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Mau_2_Cho_chu_vi_tim_do_dai_canh\"><\/span>M\u1eabu 2: Cho chu vi, t\u00ecm \u0111\u1ed9 d\u00e0i c\u1ea1nh<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p dir=\"ltr\">B\u00e0i t\u1eadp n\u00e0y s\u1ebd ng\u01b0\u1ee3c l\u1ea1i so v\u1edbi M\u1eabu 1 \u1edf tr\u00ean, khi v\u1ea5n \u0111\u1ec1 s\u1ebd \u0111\u01b0a ra chu vi c\u1ee7a t\u1ee9 gi\u00e1c v\u00e0 y\u00eau c\u1ea7u t\u00ednh chi\u1ec1u d\u00e0i c\u1ea1nh. V\u00ec v\u1eady, n\u00f3 c\u0169ng s\u1ebd \u0111\u01b0\u1ee3c d\u1ef1a tr\u00ean c\u00f4ng th\u1ee9c P = A + B + C + D \u0111\u1ec3 t\u00ednh c\u1ea1nh t\u01b0\u01a1ng \u1ee9ng.<\/p>\n<p dir=\"ltr\"><em>V\u00ed d\u1ee5, MNPQ t\u1ee9 gi\u00e1c c\u00f3 chu vi 52cm, bi\u1ebft t\u1ed5ng chi\u1ec1u d\u00e0i c\u1ee7a hai b\u00ean Mn v\u00e0 NP l\u00e0 21cm. T\u00ecm t\u1ed5ng chi\u1ec1u d\u00e0i c\u1ee7a hai c\u1ea1nh PQ v\u00e0 QM<\/em><\/p>\n<p dir=\"ltr\"><em>Ph\u1ea7n th\u01b0\u1edfng:<\/em><\/p>\n<p dir=\"ltr\"><em>Ch\u00fang ta c\u00f3 chu vi c\u1ee7a t\u1ee9 gi\u00e1c mnpq: p = mn + np + pq + qm = 52<\/em><\/p>\n<p dir=\"ltr\"><em>MN + NP = 21 P = 21 + (PQ + QM) = 45 (cm)<\/em><\/p>\n<p dir=\"ltr\"><em>T\u1ed5ng chi\u1ec1u d\u00e0i c\u1ee7a hai b\u00ean PQ v\u00e0 QM l\u00e0: PQ + QM = 52 &#8211; 21 = 31<\/em><\/p>\n<p dir=\"ltr\"><em>Tr\u1ea3 l\u1eddi: 31cm<\/em><\/p>\n<h3 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Mau_3_chu_vi_tu_giac_dac_biet\"><\/span>M\u1eabu 3: chu vi t\u1ee9 gi\u00e1c \u0111\u1eb7c bi\u1ec7t<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 s\u1ebd cung c\u1ea5p m\u1ed9t h\u00ecnh t\u1ee9 gi\u00e1c c\u1ee5 th\u1ec3 nh\u01b0 h\u00ecnh vu\u00f4ng, h\u00ecnh ch\u1eef nh\u1eadt, &#8230; k\u00e8m theo d\u1eef li\u1ec7u \u1edf c\u1ea1nh, c\u00e1c y\u00eau c\u1ea7u v\u1ec1 chu vi c\u1ee7a h\u00ecnh \u1ea3nh \u0111\u00f3. V\u00ec v\u1eady, t\u00f9y thu\u1ed9c v\u00e0o h\u00ecnh \u1ea3nh s\u1ebd \u00e1p d\u1ee5ng c\u00f4ng th\u1ee9c t\u01b0\u01a1ng \u1ee9ng \u0111\u1ec3 t\u00ednh to\u00e1n ch\u00ednh x\u00e1c.<\/p>\n<p dir=\"ltr\"><em>V\u00ed d\u1ee5, \u0111\u1ed1i v\u1edbi m\u1ed9t v\u00f9ng \u0111\u1ea5t vu\u00f4ng v\u1edbi chi\u1ec1u d\u00e0i c\u1ea1nh t\u01b0\u01a1ng \u1ee9ng l\u00e0 12cm. T\u00ednh chu vi c\u1ee7a v\u00f9ng \u0111\u1ea5t \u0111\u00f3.<\/em><\/p>\n<p dir=\"ltr\"><em>Ph\u1ea7n th\u01b0\u1edfng:<\/em><\/p>\n<p dir=\"ltr\"><em>Chu vi c\u1ee7a v\u00f9ng \u0111\u1ea5t vu\u00f4ng l\u00e0: P = ax 4 = 12 x 4 = 48cm.<\/em><\/p>\n<p dir=\"ltr\"><em>Tr\u1ea3 l\u1eddi: 48cm<\/em><\/p>\n<table style=\"border-collapse: collapse;margin-left: auto;margin-right: auto;width: 100%;background-color: #fbeeb8\" border=\"1\">\n<tr>\n<td style=\"width: 98.5932%;text-align: center\">Cha m\u1eb9 mu\u1ed1n con c\u00e1i h\u1ecdc to\u00e1n v\u00e0 \u0111\u1ea1i s\u1ed1? Tham kh\u1ea3o \u1ee8ng d\u1ee5ng To\u00e1n Shining Home &#8211; Gia \u0111\u00ecnh Anh Ng\u1eef \u0111\u1ec3 d\u1ea1y to\u00e1n h\u1ecdc cho tr\u1ebb m\u1eabu gi\u00e1o v\u00e0 h\u1ecdc ti\u1ec3u h\u1ecdc theo ch\u01b0\u01a1ng tr\u00ecnh gi\u00e1o d\u1ee5c m\u1edbi b\u1eb1ng ng\u00f4n ng\u1eef ti\u1ebfng Anh h\u00e0ng \u0111\u1ea7u c\u1ee7a Vi\u1ec7t Nam.  <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\/timhieungay.png\" width=\"185\"><\/td>\n<\/tr>\n<\/table>\n<h2 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Thuc_hanh_cach_tinh_chu_vi_cua_tu_giac_toan_hoc_3_va_4\"><\/span>Th\u1ef1c h\u00e0nh c\u00e1ch t\u00ednh chu vi c\u1ee7a t\u1ee9 gi\u00e1c to\u00e1n h\u1ecdc 3 v\u00e0 4<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p dir=\"ltr\">\u0110\u00e2y s\u1ebd l\u00e0 m\u1ed9t b\u1ea3n t\u00f3m t\u1eaft v\u1ec1 m\u1ed9t s\u1ed1 t\u00ednh to\u00e1n chu vi c\u1ee7a t\u1ee9 gi\u00e1c \u0111\u1ec3 em b\u00e9 c\u1ee7a b\u1ea1n c\u00f3 th\u1ec3 \u00e1p d\u1ee5ng ki\u1ebfn \u200b\u200bth\u1ee9c v\u00e0 th\u1ef1c h\u00e0nh tr\u00ean:<\/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\/chu-vi-hinh-tu-giac-4.jpg\" alt=\"(Ngu\u1ed3n: T\u00f3m t\u1eaft)\" width=\"100%\"><\/p>\n<p dir=\"ltr\">\n<h2 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Bi_quyet_de_giup_be_ghi_nho_cach_tinh_chu_vi_cua_tu_giac_mot_cach_hieu_qua\"><\/span>B\u00ed quy\u1ebft \u0111\u1ec3 gi\u00fap b\u00e9 ghi nh\u1edb c\u00e1ch t\u00ednh chu vi c\u1ee7a t\u1ee9 gi\u00e1c m\u1ed9t c\u00e1ch hi\u1ec7u qu\u1ea3<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p dir=\"ltr\">C\u00f4ng th\u1ee9c chu vi c\u1ee7a t\u1ee9 gi\u00e1c kh\u00f4ng ch\u1ec9 l\u00e0 gi\u1ea3i quy\u1ebft c\u00e1c b\u00e0i t\u1eadp to\u00e1n trong ch\u01b0\u01a1ng tr\u00ecnh h\u1ecdc t\u1eadp m\u00e0 c\u00f2n \u0111\u01b0\u1ee3c \u00e1p d\u1ee5ng trong th\u1ef1c t\u1ebf \u0111\u1ec3 gi\u1ea3i quy\u1ebft c\u00e1c nhi\u1ec7m v\u1ee5 c\u1ee5 th\u1ec3 nh\u01b0 x\u00e2y d\u1ef1ng, thi\u1ebft k\u1ebf, v.v. cho tr\u1ebb em \u1edf c\u1ea5p 1, \u0111\u1eb7c bi\u1ec7t l\u00e0 \u1edf l\u1edbp 3, 4, ch\u00fang c\u1ea7n n\u1eafm b\u1eaft ki\u1ebfn \u200b\u200bth\u1ee9c c\u01a1 b\u1ea3n n\u00e0y \u0111\u1ec3 t\u00ecm hi\u1ec3u ph\u1ea7n t\u00ednh to\u00e1n \u1edf t\u1ea7ng l\u1edbp th\u01b0\u1ee3ng l\u01b0u. M\u1ed9t s\u1ed1 ph\u01b0\u01a1ng ph\u00e1p c\u1ee7a cha m\u1eb9 n\u00ean \u00e1p d\u1ee5ng:<\/p>\n<h3 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Tao_su_phan_khich_khi_hoc_toan_cho_tre_em_voi_toan_hoc_khi\"><\/span>T\u1ea1o s\u1ef1 ph\u1ea5n kh\u00edch khi h\u1ecdc to\u00e1n cho tr\u1ebb em v\u1edbi to\u00e1n h\u1ecdc kh\u1ec9<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p dir=\"ltr\">B\u1edfi v\u00ec to\u00e1n h\u1ecdc l\u00e0 m\u1ed9t m\u00f4n h\u1ecdc xoay quanh s\u1ed1 l\u01b0\u1ee3ng, t\u00ednh to\u00e1n v\u00e0 h\u00ecnh h\u1ecdc. C\u00f9ng v\u1edbi s\u1ed1 l\u01b0\u1ee3ng ki\u1ebfn \u200b\u200bth\u1ee9c kh\u00e1 nhi\u1ec1u, c\u1ea7n ph\u1ea3i c\u00f3 ph\u01b0\u01a1ng ph\u00e1p gi\u1ea3ng d\u1ea1y ph\u00f9 h\u1ee3p \u0111\u1ec3 tr\u1ebb em quan t\u00e2m v\u00e0 c\u00f3 \u0111\u01b0\u1ee3c ki\u1ebfn \u200b\u200bth\u1ee9c m\u1ed9t c\u00e1ch hi\u1ec7u qu\u1ea3.<\/p>\n<p dir=\"ltr\">N\u1ebfu cha m\u1eb9 kh\u00f4ng c\u00f3 nhi\u1ec1u th\u1eddi gian \u0111\u1ec3 h\u1ed7 tr\u1ee3 tr\u1ebb em h\u1ecdc t\u1eadp, ho\u1eb7c kh\u00f4ng t\u1ef1 tin v\u1ec1 vi\u1ec7c truy\u1ec1n t\u1ea3i ki\u1ebfn \u200b\u200bth\u1ee9c c\u1ee7a ch\u00fang, ch\u00fang c\u00f3 th\u1ec3 ch\u1ecdn to\u00e1n h\u1ecdc kh\u1ec9 \u0111\u1ec3 \u0111i c\u00f9ng ch\u00fang. \u0110\u00e2y l\u00e0 m\u1ed9t trong nh\u1eefng \u1ee9ng d\u1ee5ng \u0111\u1ec3 d\u1ea1y to\u00e1n ti\u1ebfng Anh \u0111\u01b0\u1ee3c h\u00e0ng tri\u1ec7u ph\u1ee5 huynh tin t\u01b0\u1edfng.<\/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\/chu-vi-hinh-tu-giac-01.jpg\" alt=\"T\u1ea1o m\u1ed9t n\u1ec1n t\u1ea3ng to\u00e1n h\u1ecdc cho tr\u1ebb em v\u1edbi to\u00e1n h\u1ecdc kh\u1ec9. (\u1ea2nh: Kh\u1ec9)\" width=\"800\" height=\"545\"><\/p>\n<p dir=\"ltr\">T\u00ednh n\u0103ng \u0111\u1eb7c bi\u1ec7t c\u1ee7a Shining Home &#8211; Gia \u0111\u00ecnh Anh Ng\u1eef Math l\u00e0 H\u01b0\u1edbng d\u1eabn d\u1ea1y tr\u1ebb h\u1ecdc to\u00e1n d\u1ef1a tr\u00ean nhi\u1ec1u ph\u01b0\u01a1ng ph\u00e1p kh\u00e1c nhau. Ti\u00eau bi\u1ec3u:<\/p>\n<ul>\n<li dir=\"ltr\">\u00c1p d\u1ee5ng c\u00e1c ph\u01b0\u01a1ng ph\u00e1p gi\u1ea3ng d\u1ea1y t\u00edch c\u1ef1c: K\u00edch th\u00edch s\u1ef1 s\u00e1ng t\u1ea1o, tr\u1ebb em ch\u1ee7 \u0111\u1ed9ng \u0111\u1eb7t c\u00e2u h\u1ecfi \u0111\u1ec3 hi\u1ec3u g\u1ed1c r\u1ec5 c\u1ee7a v\u1ea5n \u0111\u1ec1 \u0111\u01b0\u1ee3c \u0111\u01b0a ra trong to\u00e1n h\u1ecdc.<\/li>\n<li dir=\"ltr\">H\u1ecdc th\u00f4ng qua tr\u00f2 ch\u01a1i: Ch\u01a1i v\u00e0 h\u1ecdc t\u1eadp nh\u01b0ng hi\u1ec7u qu\u1ea3. T\u00f4i quan t\u00e2m, t\u1ef1 nguy\u1ec7n h\u1ecdc m\u00e0 kh\u00f4ng c\u00f3 l\u1eddi nh\u1eafc c\u1ee7a cha m\u1eb9.<\/li>\n<li dir=\"ltr\">Nghi\u00ean c\u1ee9u v\u1edbi c\u00e1c b\u00e0i t\u1eadp b\u1ed5 sung: Gi\u00fap con b\u1ea1n ph\u00e1t tri\u1ec3n c\u00e1c k\u1ef9 n\u0103ng v\u1eadn \u0111\u1ed9ng b\u00e1n v\u00e0 \u0111\u1ed9ng c\u01a1 th\u00f4 th\u00f4ng qua vi\u1ec7c gi\u1ea3i quy\u1ebft c\u00e1c v\u1ea5n \u0111\u1ec1 th\u1ef1c t\u1ebf.<\/li>\n<\/ul>\n<p dir=\"ltr\">N\u1ed9i dung c\u1ee7a ch\u01b0\u01a1ng tr\u00ecnh gi\u1ea3ng d\u1ea1y s\u1ebd d\u1ef1a tr\u00ean h\u01a1n 60 ch\u1ee7 \u0111\u1ec1 c\u1ee7a 7 ch\u1ee7 \u0111\u1ec1 to\u00e1n h\u1ecdc ch\u00ednh \u0111\u1ec3 gi\u00fap tr\u1ebb d\u1ec5 d\u00e0ng n\u1eafm b\u1eaft c\u00e1c kh\u00e1i ni\u1ec7m to\u00e1n h\u1ecdc, bao g\u1ed3m c\u1ea3 ki\u1ebfn \u200b\u200bth\u1ee9c h\u00ecnh h\u1ecdc. N\u00f3 s\u1ebd gi\u00fap x\u00e2y d\u1ef1ng c\u00e1c n\u1ec1n t\u1ea3ng to\u00e1n h\u1ecdc v\u00e0 c\u00e1c l\u1edbp h\u1ed7 tr\u1ee3 trong l\u1edbp m\u1ed9t c\u00e1ch hi\u1ec7u qu\u1ea3, c\u0169ng nh\u01b0 gi\u00fap tr\u1ebb ph\u00e1t tri\u1ec3n t\u01b0 duy &amp; ng\u00f4n ng\u1eef \u0111\u1ed3ng b\u1ed9 \u0111\u1ec3 gi\u00fap tr\u1ebb h\u1ecdc to\u00e1n v\u00e0 ti\u1ebfng Anh t\u1ed1t.<\/p>\n<p dir=\"ltr\">\u0110\u0103ng k\u00fd t\u00e0i kho\u1ea3n c\u1ee7a b\u1ea1n ngay t\u1ea1i \u0111\u00e2y \u0111\u1ec3 nh\u1eadn \u0111\u01b0\u1ee3c gi\u1ea3m gi\u00e1 t\u1edbi 40% v\u00e0 t\u00e0i li\u1ec7u h\u1ecdc t\u1eadp mi\u1ec5n ph\u00ed!<\/p>\n<h3 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Hay_chac_chan_rang_em_be_cua_ban_lam_chu_kien_%E2%80%8B%E2%80%8Bthuc_co_ban_ve_chu_vi_tu_giac\"><\/span>H\u00e3y ch\u1eafc ch\u1eafn r\u1eb1ng em b\u00e9 c\u1ee7a b\u1ea1n l\u00e0m ch\u1ee7 ki\u1ebfn \u200b\u200bth\u1ee9c c\u01a1 b\u1ea3n v\u1ec1 chu vi t\u1ee9 gi\u00e1c<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p dir=\"ltr\">\u0110\u1ec3 c\u00f3 th\u1ec3 gi\u1ea3i quy\u1ebft \u1ee9ng d\u1ee5ng t\u1ee9 gi\u00e1c v\u00e0 ch\u00ednh x\u00e1c trong th\u1ef1c t\u1ebf, n\u00f3 \u0111\u00f2i h\u1ecfi tr\u1ebb em ph\u1ea3i l\u00e0m ch\u1ee7 ki\u1ebfn \u200b\u200bth\u1ee9c c\u01a1 b\u1ea3n li\u00ean quan \u0111\u1ebfn ch\u00fang. Bao g\u1ed3m: T\u1ee9 gi\u00e1c l\u00e0 g\u00ec, c\u00e1c lo\u1ea1i h\u00ecnh t\u1ee9 gi\u00e1c, c\u00f4ng th\u1ee9c chu vi, b\u00e0i t\u1eadp, &#8230;<\/p>\n<p dir=\"ltr\">\u0110\u1ec3 l\u00e0m \u0111i\u1ec1u n\u00e0y, cha m\u1eb9 n\u00ean \u0111i c\u00f9ng con c\u00e1i, th\u01b0\u1eddng xuy\u00ean h\u1ecfi c\u00e1c c\u00e2u h\u1ecfi li\u00ean quan \u0111\u1ec3 xem h\u1ecd nh\u1edb ki\u1ebfn \u200b\u200bth\u1ee9c nh\u01b0 th\u1ebf n\u00e0o, ki\u1ec3m tra s\u00e1ch, &#8230; \u0110i\u1ec1u n\u00e0y s\u1ebd gi\u00fap b\u1ea1n bi\u1ebft kh\u1ea3 n\u0103ng h\u1ecdc t\u1eadp c\u1ee7a con b\u1ea1n, c\u00f9ng v\u1edbi vi\u1ec7c bi\u1ebft r\u1eb1ng em b\u00e9 c\u1ee7a b\u1ea1n y\u1ebfu c\u00f3 th\u1ec3 c\u1ee7ng c\u1ed1 k\u1ecbp th\u1eddi.<\/p>\n<h3 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Voi_em_be_cua_ban_de_luyen_tap_thuc_hanh_nhieu_hon\"><\/span>V\u1edbi em b\u00e9 c\u1ee7a b\u1ea1n \u0111\u1ec3 luy\u1ec7n t\u1eadp, th\u1ef1c h\u00e0nh nhi\u1ec1u h\u01a1n<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p dir=\"ltr\">Trong qu\u00e1 tr\u00ecnh h\u1ecdc t\u1eadp c\u1ee7a em b\u00e9, ph\u1ee5 huynh n\u00ean t\u1ea1o \u0111i\u1ec1u ki\u1ec7n cho con c\u00e1i c\u1ee7a h\u1ecd th\u1ef1c h\u00e0nh th\u01b0\u1eddng xuy\u00ean t\u1eeb nhi\u1ec1u b\u00e0i t\u1eadp li\u00ean quan trong s\u00e1ch gi\u00e1o khoa, internet, ki\u1ec3m tra c\u00e1c k\u1ef3 thi, h\u1ecdc h\u1ecfi nhi\u1ec1u ki\u1ebfn \u200b\u200bth\u1ee9c m\u1edbi, t\u1ed5 ch\u1ee9c c\u00e1c cu\u1ed9c thi nh\u1ecf cho tr\u1ebb em, h\u1ecdc to\u00e1n th\u00f4ng qua c\u00e1c tr\u00f2 ch\u01a1i &#8230;<\/p>\n<p dir=\"ltr\">\u0110\u00f3 l\u00e0 th\u1ef1c h\u00e0nh nhi\u1ec1u h\u01a1n, n\u00f3 s\u1ebd d\u1ec5 d\u00e0ng c\u00f3 \u0111\u01b0\u1ee3c ki\u1ebfn \u200b\u200bth\u1ee9c, c\u0169ng nh\u01b0 quan t\u00e2m nhi\u1ec1u h\u01a1n \u0111\u1ebfn vi\u1ec7c h\u1ecdc to\u00e1n \u00edt nh\u00e0m ch\u00e1n.<\/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\/chu-vi-hinh-tu-giac-6.jpg\" alt=\"C\u00f9ng v\u1edbi tr\u1ebb em \u0111\u1ec3 l\u00e0m ch\u1ee7 ki\u1ebfn \u200b\u200bth\u1ee9c v\u00e0 th\u1ef1c h\u00e0nh th\u01b0\u1eddng xuy\u00ean. (\u1ea2nh: B\u1ed9 s\u01b0u t\u1eadp Internet)\" width=\"100%\"><\/p>\n<\/p>\n<p dir=\"ltr\">Tr\u00ean \u0111\u00e2y l\u00e0 ki\u1ebfn \u200b\u200bth\u1ee9c gi\u00fap tr\u1ebb hi\u1ec3u r\u00f5 h\u01a1n chu vi c\u1ee7a t\u1ee9 gi\u00e1c. N\u00f3i chung, ki\u1ebfn \u200b\u200bth\u1ee9c c\u01a1 b\u1ea3n n\u00e0y s\u1ebd c\u00f3 nh\u1eefng ph\u1ea7n d\u1ec5 d\u00e0ng, c\u00e1c ph\u1ea7n kh\u00f3 kh\u0103n, ch\u1ec9 l\u00e0 ch\u1ee7 nh\u01b0ng th\u00f4ng tin m\u00e0 kh\u1ec9 chia s\u1ebb s\u1ebd gi\u00fap tr\u1ebb chinh ph\u1ee5c c\u00e1c b\u00e0i t\u1eadp m\u1ed9t c\u00e1ch hi\u1ec7u qu\u1ea3 nh\u1ea5t. Ch\u00fac tr\u1ebb em c\u00f3 nh\u1eefng nghi\u00ean c\u1ee9u th\u00fa v\u1ecb.<\/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<p>                                      T\u00e0i li\u1ec7u tham kh\u1ea3o<\/p>\n<p>Chu vi c\u1ee7a t\u1ee9 gi\u00e1c<\/p>\n<p>https:\/\/www.cuemath.com\/meas mua s\u1eafm<\/p>\n<p>Chu vi c\u1ee7a t\u1ee9 gi\u00e1c<\/p>\n<p>https:\/\/www.math-inly-math.com\/perimet-of-quadrilateral.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>Chu vi c\u1ee7a t\u1ee9 gi\u00e1c l\u00e0 m\u1ed9t ki\u1ebfn \u200b\u200bth\u1ee9c kh\u00e1 r\u1ed9ng, b\u1edfi v\u00ec h\u00ecnh h\u1ecdc n\u00e0y c\u00f3 nhi\u1ec1u th\u1ec3 lo\u1ea1i kh\u00e1c nhau, c\u00f4ng th\u1ee9c c\u0169ng r\u1ea5t \u0111a d\u1ea1ng. Do \u0111\u00f3, \u0111\u1ec3 gi\u00fap h\u1ecd hi\u1ec3u \u0111\u1ea7y \u0111\u1ee7 v\u00e0 ch\u00ednh x\u00e1c chu vi c\u1ee7a c\u00e1c lo\u1ea1i t\u1ee9 gi\u00e1c, h\u00e3y \u0111\u1ec3 kh\u1ec9 ngay l\u1eadp t\u1ee9c \u0111\u1ec1 c\u1eadp \u0111\u1ebfn&#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-14019","post","type-post","status-publish","format-standard","hentry","category-kien-thuc"],"_links":{"self":[{"href":"https:\/\/www.ckconitsha.com\/vn\/wp-json\/wp\/v2\/posts\/14019","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=14019"}],"version-history":[{"count":2,"href":"https:\/\/www.ckconitsha.com\/vn\/wp-json\/wp\/v2\/posts\/14019\/revisions"}],"predecessor-version":[{"id":16728,"href":"https:\/\/www.ckconitsha.com\/vn\/wp-json\/wp\/v2\/posts\/14019\/revisions\/16728"}],"wp:attachment":[{"href":"https:\/\/www.ckconitsha.com\/vn\/wp-json\/wp\/v2\/media?parent=14019"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ckconitsha.com\/vn\/wp-json\/wp\/v2\/categories?post=14019"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ckconitsha.com\/vn\/wp-json\/wp\/v2\/tags?post=14019"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}