{"id":15163,"date":"2025-07-01T08:45:04","date_gmt":"2025-07-01T01:45:04","guid":{"rendered":"https:\/\/www.ckconitsha.com\/vn\/?p=15163"},"modified":"2025-07-01T09:35:18","modified_gmt":"2025-07-01T02:35:18","slug":"cong-thuc-tinh-chu-vi-hinh-thoi-va-huong-dan-giai-bai-tap-chi-tiet","status":"publish","type":"post","link":"https:\/\/www.ckconitsha.com\/vn\/cong-thuc-tinh-chu-vi-hinh-thoi-va-huong-dan-giai-bai-tap-chi-tiet\/","title":{"rendered":"C\u00f4ng th\u1ee9c t\u00ednh chu vi h\u00ecnh thoi v\u00e0 h\u01b0\u1edbng d\u1eabn gi\u1ea3i b\u00e0i t\u1eadp chi ti\u1ebft"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_79_2 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.ckconitsha.com\/vn\/cong-thuc-tinh-chu-vi-hinh-thoi-va-huong-dan-giai-bai-tap-chi-tiet\/#Cong_thuc_tinh_toan_chu_vi_cua_kim_cuong\" >C\u00f4ng th\u1ee9c t\u00ednh to\u00e1n chu vi c\u1ee7a kim c\u01b0\u01a1ng<\/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-thoi-va-huong-dan-giai-bai-tap-chi-tiet\/#Mot_so_loai_bai_tap_chu_vi_hinh_thoi_pho_bien\" >M\u1ed9t s\u1ed1 lo\u1ea1i b\u00e0i t\u1eadp chu vi h\u00ecnh thoi 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-3\" href=\"https:\/\/www.ckconitsha.com\/vn\/cong-thuc-tinh-chu-vi-hinh-thoi-va-huong-dan-giai-bai-tap-chi-tiet\/#Mau_1_Tinh_chu_vi_cua_hinh_thoi\" >M\u1eabu 1. T\u00ednh chu vi c\u1ee7a h\u00ecnh thoi<\/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-thoi-va-huong-dan-giai-bai-tap-chi-tiet\/#Mau_2_Tinh_do_dai_cua_cac_canh_khi_biet_chu_vi_cua_hinh_thoi\" >M\u1eabu 2. T\u00ednh \u0111\u1ed9 d\u00e0i c\u1ee7a c\u00e1c c\u1ea1nh khi bi\u1ebft chu vi c\u1ee7a h\u00ecnh thoi<\/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-thoi-va-huong-dan-giai-bai-tap-chi-tiet\/#Mau_3_Tinh_chu_vi_vi_mo_cua_duong_cheo\" >M\u1eabu 3. T\u00ednh chu vi v\u0129 m\u00f4 c\u1ee7a \u0111\u01b0\u1eddng ch\u00e9o<\/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-thoi-va-huong-dan-giai-bai-tap-chi-tiet\/#Tap_the_duc_ve_chu_vi_cua_hinh_thoi_de_em_be_tap_luyen\" >T\u1eadp th\u1ec3 d\u1ee5c v\u1ec1 chu vi c\u1ee7a h\u00ecnh thoi \u0111\u1ec3 em b\u00e9 t\u1eadp luy\u1ec7n<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/www.ckconitsha.com\/vn\/cong-thuc-tinh-chu-vi-hinh-thoi-va-huong-dan-giai-bai-tap-chi-tiet\/#Meo_de_giup_con_ban_thuc_hien_bai_tap_vi_mo_-Perimeteral\" >M\u1eb9o \u0111\u1ec3 gi\u00fap con b\u1ea1n th\u1ef1c hi\u1ec7n b\u00e0i t\u1eadp vi m\u00f4 -Perimeteral<\/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\/cong-thuc-tinh-chu-vi-hinh-thoi-va-huong-dan-giai-bai-tap-chi-tiet\/#Xay_dung_mot_nen_tang_va_niem_dam_me_toan_hoc_cho_tre_em_voi_toan_hoc_khi\" >X\u00e2y d\u1ef1ng m\u1ed9t n\u1ec1n t\u1ea3ng v\u00e0 ni\u1ec1m \u0111am m\u00ea to\u00e1n h\u1ecdc 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-9\" href=\"https:\/\/www.ckconitsha.com\/vn\/cong-thuc-tinh-chu-vi-hinh-thoi-va-huong-dan-giai-bai-tap-chi-tiet\/#Ho_tro_va_cung_co_kien_%E2%80%8B%E2%80%8Bthuc_co_ban_ve_hinh_thoi_cho_tre_em\" >H\u1ed7 tr\u1ee3 v\u00e0 c\u1ee7ng c\u1ed1 ki\u1ebfn \u200b\u200bth\u1ee9c c\u01a1 b\u1ea3n v\u1ec1 h\u00ecnh thoi cho tr\u1ebb em<\/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\/cong-thuc-tinh-chu-vi-hinh-thoi-va-huong-dan-giai-bai-tap-chi-tiet\/#Thuc_hanh_thuc_hanh_thuong_xuyen\" >Th\u1ef1c h\u00e0nh, 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-11\" href=\"https:\/\/www.ckconitsha.com\/vn\/cong-thuc-tinh-chu-vi-hinh-thoi-va-huong-dan-giai-bai-tap-chi-tiet\/#Tim_hieu_cong_thuc_chu_vi_hinh_thoi_thong_qua_tho\" >T\u00ecm hi\u1ec3u c\u00f4ng th\u1ee9c chu vi h\u00ecnh thoi th\u00f4ng qua th\u01a1<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/www.ckconitsha.com\/vn\/cong-thuc-tinh-chu-vi-hinh-thoi-va-huong-dan-giai-bai-tap-chi-tiet\/#Mot_so_ghi_chu_khi_tinh_chu_vi_hinh_thoi\" >M\u1ed9t s\u1ed1 ghi ch\u00fa khi t\u00ednh chu vi h\u00ecnh thoi<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/www.ckconitsha.com\/vn\/cong-thuc-tinh-chu-vi-hinh-thoi-va-huong-dan-giai-bai-tap-chi-tiet\/#Ket_luan\" >K\u1ebft lu\u1eadn<\/a><\/li><\/ul><\/nav><\/div>\n<\/p>\n<p>Chu vi h\u00ecnh thoi s\u1ebd b\u1eb1ng chi\u1ec1u d\u00e0i c\u1ee7a c\u00e1c \u0111\u01b0\u1eddng xung quanh h\u00ecnh \u1ea3nh ho\u1eb7c \u0111\u01b0\u1eddng bao quanh to\u00e0n b\u1ed9 khu v\u1ef1c. \u0110\u1ec3 c\u00f3 th\u1ec3 t\u00ednh to\u00e1n chu vi c\u1ee7a h\u00ecnh thoi chi ti\u1ebft, ch\u00fang ta c\u1ea7n ph\u1ea3i c\u00f3 m\u1ed9t c\u00f4ng th\u1ee9c c\u1ee5 th\u1ec3.<\/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 c\u00e1c k\u1ef9 n\u0103ng ng\u00f4n ng\u1eef c\u1ee7a ch\u00fang th\u00f4ng qua c\u00e1c \u1ee9ng d\u1ee5ng h\u1ecdc t\u1eadp c\u1ee7a kh\u1ec9<\/p>\n<p class=\"description\">\u0110\u0103ng k\u00fd ngay \u0111\u1ec3 \u0111\u01b0\u1ee3c t\u01b0 v\u1ea5n mi\u1ec5n ph\u00ed v\u1ec1 c\u00e1c s\u1ea3n ph\u1ea9m v\u00e0 tuy\u1ebfn h\u1ecdc h\u1ecdc cho tr\u1ebb em.<\/p>\n<p>                                                                            *Vui l\u00f2ng ki\u1ec3m tra t\u00ean \u0111\u1ea7y \u0111\u1ee7 c\u1ee7a b\u1ea1n *Vui l\u00f2ng ki\u1ec3m tra s\u1ed1 \u0111i\u1ec7n tho\u1ea1i h\u01a1n 2.000 t\u1eeb &amp; 6.000 c\u00e2u ti\u1ebfng Anh \u0111\u1ec3 ph\u00e1t tri\u1ec3n to\u00e0n di\u1ec7n 4 k\u1ef9 n\u0103ng ti\u1ebfng Anh t\u1ed1t &#8211; ti\u1ebfng Anh theo c\u00e1c ph\u01b0\u01a1ng ph\u00e1p hi\u1ec7n \u0111\u1ea1i ph\u00e1t tri\u1ec3n kh\u1ea3 n\u0103ng EQ &amp; Vi\u1ec7t Nam *B\u1ea1n ch\u01b0a ch\u1ecdn b\u1ea5t k\u1ef3 m\u1ee5c n\u00e0o! \u0110\u0103ng k\u00fd t\u01b0 v\u1ea5n mi\u1ec5n ph\u00ed<\/p>\n<p dir=\"ltr\">H\u00ecnh thoi l\u00e0 m\u1ed9t ng\u00f4i m\u1ed9 t\u1ee9 gi\u00e1c v\u1edbi 4 c\u1ea1nh b\u1eb1ng nhau. \u0110\u00e2y c\u0169ng l\u00e0 m\u1ed9t h\u00ecnh b\u00ecnh h\u00e0nh v\u1edbi hai \u0111\u01b0\u1eddng ch\u00e9o vu\u00f4ng g\u00f3c v\u1edbi nhau ho\u1eb7c hai c\u1ea1nh li\u1ec1n k\u1ec1. \u0110\u1ec3 c\u00f3 th\u1ec3 t\u00ednh to\u00e1n chu vi c\u1ee7a h\u00ecnh thoi, ch\u00fang t\u00f4i \u00e1p d\u1ee5ng c\u00f4ng th\u1ee9c sau:<\/p>\n<h2 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Cong_thuc_tinh_toan_chu_vi_cua_kim_cuong\"><\/span>C\u00f4ng th\u1ee9c t\u00ednh to\u00e1n chu vi c\u1ee7a kim c\u01b0\u01a1ng<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p dir=\"ltr\">Chu vi h\u00ecnh thoi \u0111\u01b0\u1ee3c t\u00ednh to\u00e1n d\u1ef1a tr\u00ean c\u00f4ng th\u1ee9c b\u1eb1ng chi\u1ec1u d\u00e0i c\u1ee7a m\u1ed9t b\u00ean c\u1ee7a l\u00f5i v\u1edbi 4. S\u1ed1 4 \u1edf \u0111\u00e2y l\u00e0 chi\u1ec1u d\u00e0i 4 c\u1ee7a h\u00ecnh thoi.<\/p>\n<p dir=\"ltr\">C\u00f4ng th\u1ee9c: P = AX 4<\/p>\n<p dir=\"ltr\">Trong \u0111\u00f3:<\/p>\n<ul>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">P: Chu vi h\u00ecnh.<\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">A: Chi\u1ec1u d\u00e0i c\u1ee7a c\u1ea1nh h\u00ecnh thoi. <\/p>\n<\/li>\n<\/ul>\n<p dir=\"ltr\">M\u1edf r\u1ed9ng: N\u1ebfu b\u1ea1n bi\u1ebft chu vi h\u00ecnh thoi, \u0111\u1ec3 t\u00ecm c\u1ea1nh h\u00ecnh thoi, ch\u00fang t\u00f4i l\u1ea5y chu vi c\u1ee7a Ph\u00e2n khu 4.<\/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\/cach-tinh-chu-vi-hinh-thoi-1.jpg\" alt=\"Chu vi c\u1ee7a h\u00ecnh thoi s\u1ebd b\u1eb1ng chi\u1ec1u d\u00e0i c\u1ee7a h\u1ea1t nh\u00e2n v\u1edbi 4. (\u1ea2nh: B\u1ed9 s\u01b0u t\u1eadp Internet)\" width=\"100%\"><\/p>\n<p dir=\"ltr\"><em>V\u00ed d\u1ee5, n\u1eafp kim c\u01b0\u01a1ng c\u00f3 chi\u1ec1u d\u00e0i c\u1ee7a c\u00e1c c\u1ea1nh b\u1eb1ng nhau v\u00e0 b\u1eb1ng 7 cm. Bao nhi\u00eau chu vi c\u1ee7a v\u1ecf h\u00ecnh thoi n\u00e0y?<\/em><\/p>\n<p dir=\"ltr\"><em>Ch\u00fang ta c\u00f3 a = 7 cm.<\/em><\/p>\n<p dir=\"ltr\"><em>Suy lu\u1eadn, chu vi c\u1ee7a v\u1ecf kim c\u01b0\u01a1ng l\u00e0:<\/em><\/p>\n<p dir=\"ltr\"><em>P = AX 4 = 7 x 4 = 28 (cm).<\/em><\/p>\n<p dir=\"ltr\">Ngo\u00e0i ra, b\u1ea1n c\u0169ng c\u1ea7n bi\u1ebft c\u00f4ng th\u1ee9c h\u00ecnh thoi [S = 1\/2 x (\u0111\u01b0\u1eddng ch\u00e9o 1 x \u0111\u01b0\u1eddng ch\u00e9o 2)] \u0110\u1ec3 bi\u1ebft c\u00e1ch gi\u1ea3i quy\u1ebft c\u00e1c v\u1ea5n \u0111\u1ec1 to\u00e1n h\u1ecdc n\u00e2ng cao tr\u00ean chu vi c\u1ee7a h\u00ecnh thoi.<\/p>\n<h2 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Mot_so_loai_bai_tap_chu_vi_hinh_thoi_pho_bien\"><\/span>M\u1ed9t s\u1ed1 lo\u1ea1i b\u00e0i t\u1eadp chu vi h\u00ecnh thoi ph\u1ed5 bi\u1ebfn<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p dir=\"ltr\">\u0110\u1ed1i v\u1edbi ki\u1ebfn \u200b\u200bth\u1ee9c chu vi v\u1ec1 h\u00ecnh thoi, tr\u1ebb em m\u1edbi s\u1ebd \u0111\u01b0\u1ee3c l\u00e0m quen v\u00e0 chinh ph\u1ee5c c\u00e1c h\u00ecnh th\u1ee9c 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\/cach-tinh-chu-vi-hinh-thoi-2.jpg\" alt=\"C\u00f3 nhi\u1ec1u lo\u1ea1i b\u00e0i t\u1eadp li\u00ean quan \u0111\u1ebfn chu vi c\u1ee7a h\u00ecnh thoi. (\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_hinh_thoi\"><\/span>M\u1eabu 1. T\u00ednh chu vi c\u1ee7a h\u00ecnh thoi<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p dir=\"ltr\">Gi\u1ea3i ph\u00e1p: H\u1ecd ch\u1ec9 c\u1ea7n x\u00e1c \u0111\u1ecbnh chi\u1ec1u d\u00e0i c\u1ee7a c\u1ea1nh v\u00e0 \u00e1p d\u1ee5ng ti\u00eau chu\u1ea9n c\u1ee7a c\u00f4ng th\u1ee9c chu vi h\u00ecnh thoi b\u1eb1ng chi\u1ec1u d\u00e0i c\u1ee7a c\u1ea1nh c\u1ee7a l\u00f5i 4.<\/p>\n<p dir=\"ltr\"><em>V\u00ed d\u1ee5: T\u00ednh chu vi c\u1ee7a h\u00ecnh thoi<\/em><\/p>\n<p dir=\"ltr\"><em>Gi\u1ea3i quy\u1ebft: chu vi h\u00ecnh thoi \u0111\u00f3 l\u00e0: 5 x 4 = 20 (DM)<\/em><\/p>\n<h3 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Mau_2_Tinh_do_dai_cua_cac_canh_khi_biet_chu_vi_cua_hinh_thoi\"><\/span>M\u1eabu 2. T\u00ednh \u0111\u1ed9 d\u00e0i c\u1ee7a c\u00e1c c\u1ea1nh khi bi\u1ebft chu vi c\u1ee7a h\u00ecnh thoi<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p dir=\"ltr\">Ph\u01b0\u01a1ng ph\u00e1p gi\u1ea3i ph\u00e1p: T\u1eeb c\u00f4ng th\u1ee9c t\u00ednh to\u00e1n chu vi ph\u00e2n t\u1eed, suy lu\u1eadn \u0111\u1ec3 y\u00eau th\u00edch chi\u1ec1u d\u00e0i c\u1ee7a c\u1ea1nh, ch\u00fang ta l\u1ea5y chu vi c\u1ee7a Ph\u00e2n khu 4.<\/p>\n<p dir=\"ltr\"><em>V\u00ed d\u1ee5: T\u00ednh \u0111\u1ed9 d\u00e0i c\u1ee7a c\u00e1c c\u1ea1nh h\u00ecnh thoi ABCD khi bi\u1ebft chu vi h\u00ecnh thoi l\u00e0 36 cm<\/em><\/p>\n<p dir=\"ltr\"><em>Gi\u1ea3i ph\u00e1p: \u0110\u1eb7t m\u1ed9t chi\u1ec1u d\u00e0i c\u1ee7a c\u00e1c c\u1ea1nh h\u00ecnh thoi. <\/em><\/p>\n<p dir=\"ltr\"><em>P = AX 4 =&gt; A = P\/4 = 36\/4 = 9 (cm)<\/em><\/p>\n<p dir=\"ltr\"><em>Tr\u1ea3 l\u1eddi: \u0110\u1ed9 d\u00e0i c\u1ee7a m\u1ed9t b\u00ean c\u1ee7a ABCD h\u00ecnh thoi l\u00e0 9 cm<\/em><\/p>\n<h3 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Mau_3_Tinh_chu_vi_vi_mo_cua_duong_cheo\"><\/span>M\u1eabu 3. T\u00ednh chu vi v\u0129 m\u00f4 c\u1ee7a \u0111\u01b0\u1eddng ch\u00e9o<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p dir=\"ltr\">Gi\u1ea3i ph\u00e1p: \u0110\u1ec3 t\u00ednh chu vi c\u1ee7a m\u1ed9t h\u00ecnh thoi khi d\u1eef li\u1ec7u bi\u1ec3u th\u1ecb chi\u1ec1u d\u00e0i c\u1ee7a \u0111\u01b0\u1eddng ch\u00e9o. Ch\u00fang t\u00f4i s\u1ebd \u00e1p d\u1ee5ng \u0110\u1ecbnh l\u00fd Pytago trong tam gi\u00e1c vu\u00f4ng c\u1ee7a Huyen v\u1edbi t\u1ed5ng b\u00ecnh ph\u01b0\u01a1ng c\u1ee7a hai g\u00f3c vu\u00f4ng. K\u1ec3 t\u1eeb \u0111\u00f3, t\u00ecm chi\u1ec1u d\u00e0i g\u00f3c ph\u1ea3i l\u00e0 chi\u1ec1u d\u00e0i h\u00ecnh thoi.<\/p>\n<p dir=\"ltr\"><em>V\u00ed d\u1ee5: T\u00ednh chu vi kim c\u01b0\u01a1ng c\u1ee7a \u0111\u01b0\u1eddng ch\u00e9o l\u00e0 16 cm v\u00e0 30cm<\/em><\/p>\n<p dir=\"ltr\"><em>Gi\u1ea3i ph\u00e1p: G\u1ecdi c\u1ea1nh h\u00ecnh thoi b\u1eb1ng a, c\u00e1c \u0111\u01b0\u1eddng ch\u00e9o l\u1ea7n l\u01b0\u1ee3t l\u00e0 D1 v\u00e0 D2<\/em><\/p>\n<p dir=\"ltr\"><em>&#8211; \u00c1p d\u1ee5ng py &#8211; TA &#8211; \u0110\u1ecbnh l\u00fd \u0111i. Ch\u00fang ta c\u00f3: A2 = (D1\/2) 2 + (D2\/2) 2 = (8) 2 + (15) 2 ho\u1eb7c A = 17<\/em><\/p>\n<p dir=\"ltr\"><em>Chu vi machetamic: p = 4 xa = 68.<\/em><\/p>\n<p dir=\"ltr\">\n<h2 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Tap_the_duc_ve_chu_vi_cua_hinh_thoi_de_em_be_tap_luyen\"><\/span>T\u1eadp th\u1ec3 d\u1ee5c v\u1ec1 chu vi c\u1ee7a h\u00ecnh thoi \u0111\u1ec3 em b\u00e9 t\u1eadp luy\u1ec7n<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p dir=\"ltr\">D\u01b0\u1edbi \u0111\u00e2y kh\u1ec9 s\u1ebd t\u00f3m t\u1eaft m\u1ed9t s\u1ed1 b\u00e0i t\u1eadp v\u1ec1 t\u00ednh to\u00e1n chu vi c\u1ee7a h\u00ecnh thoi v\u00e0 m\u1ed9t s\u1ed1 b\u00e0i t\u1eadp li\u00ean quan \u0111\u1ec3 tr\u1ebb th\u1ef1c h\u00e0nh h\u01a1n n\u1eefa:<\/p>\n<p dir=\"ltr\">C\u00e2u 1: T\u00ednh chu vi c\u1ee7a h\u00ecnh thoi, bi\u1ebft \u0111\u1ed9 d\u00e0i c\u1ea1nh t\u01b0\u01a1ng \u1ee9ng:<\/p>\n<p dir=\"ltr\">a) 9 cm<\/p>\n<p dir=\"ltr\">b) 20 dm<\/p>\n<p dir=\"ltr\">c) 3\/4 m<\/p>\n<p dir=\"ltr\">d) 5, 6 cm<\/p>\n<p dir=\"ltr\">C\u00e2u 2: T\u00ednh chu vi c\u1ee7a h\u00ecnh thoi bi\u1ebft \u0111\u1ed9 d\u00e0i c\u1ee7a c\u1ea1nh = 15 dm.<\/p>\n<p dir=\"ltr\">C\u00e2u 3: T\u00ednh to\u00e1n ABCD chu vi khi bi\u1ebft \u0111\u1ed9 d\u00e0i c\u1ea1nh l\u00e0 7cm<\/p>\n<p dir=\"ltr\">C\u00e2u 4: T\u00ednh \u0111\u1ed9 d\u00e0i c\u1ee7a c\u00e1c c\u1ea1nh h\u00ecnh thoi ABCD khi bi\u1ebft chu vi h\u00ecnh thoi l\u00e0 60cm<\/p>\n<p dir=\"ltr\">C\u00e2u 5: T\u00ednh chu vi kim c\u01b0\u01a1ng c\u1ee7a \u0111\u01b0\u1eddng ch\u00e9o l\u00e0 16 cm v\u00e0 30cm<\/p>\n<p dir=\"ltr\">C\u00e2u 6: \u0110\u01b0a cho ABCD h\u00ecnh thoi, bi\u1ebft AB = 15 cm. Chu vi c\u1ee7a ABCD h\u00ecnh thoi l\u00e0?<\/p>\n<p dir=\"ltr\">C\u00e2u 7: T\u00ednh chu vi macal c\u1ee7a b\u00ean l\u00e0 5\/6 dm<\/p>\n<p dir=\"ltr\">C\u00e2u 8: Chu vi 20 cm, chi\u1ec1u d\u00e0i c\u1ea1nh c\u1ee7a n\u00f3 l\u00e0 bao nhi\u00eau?<\/p>\n<p dir=\"ltr\">C\u00e2u 9: T\u00ednh \u0111\u1ed9 d\u00e0i c\u1ee7a c\u00e1c c\u1ea1nh h\u00ecnh thoi ABCD khi bi\u1ebft chu vi h\u00ecnh thoi l\u00e0 60cm<\/p>\n<p dir=\"ltr\">C\u00e2u 10: S\u00e2n l\u01b0u tr\u1eef h\u00ecnh thoi \u0111\u01b0\u1ee3c m\u1edf r\u1ed9ng \u1edf ph\u00eda b\u00ean ph\u1ea3i b\u00ean ph\u1ea3i 3 m, 2 c\u1ea1nh th\u1ea5p h\u01a1n th\u00eam 10 m, do \u0111\u00f3 n\u00f3 tr\u1edf th\u00e0nh m\u1ed9t h\u00ecnh b\u00ecnh h\u00e0nh v\u1edbi chu vi 106 m. T\u00ednh to\u00e1n c\u1ea1nh c\u1ee7a s\u00e2n kho ban \u0111\u1ea7u.<\/p>\n<p dir=\"ltr\">C\u00e2u 11: T\u00ednh chu vi c\u1ee7a h\u00ecnh thoi ABCD v\u1edbi chi\u1ec1u d\u00e0i AB = 5cm.<\/p>\n<p dir=\"ltr\">C\u00e2u 12: \u0110\u01b0a ra m\u1ed9t h\u00ecnh thoi ABCD v\u1edbi chu vi 20 cm, \u0111\u01b0\u1eddng ch\u00e9o BD = 6cm. T\u00ednh chi\u1ec1u d\u00e0i c\u1ee7a AC ch\u00e9o.<\/p>\n<p dir=\"ltr\">C\u00e2u 13: Hai \u0111\u01b0\u1eddng ch\u00e9o c\u1ee7a h\u00ecnh thoi c\u00f3 chi\u1ec1u d\u00e0i 6cm v\u00e0 8cm. T\u00ednh chu vi h\u00ecnh thoi \u0111\u00f3.<\/p>\n<p dir=\"ltr\">C\u00e2u 14: M\u1ed9t h\u00ecnh thoi c\u00f3 chi\u1ec1u d\u00e0i 20 cm. Chu vi h\u00ecnh thoi \u0111\u00f3 l\u00e0 bao nhi\u00eau?<\/p>\n<p dir=\"ltr\">C\u00e2u 15: T\u00ednh to\u00e1n ABCD chu vi khi bi\u1ebft \u0111\u1ed9 d\u00e0i c\u1ea1nh l\u00e0 10cm.<\/p>\n<p dir=\"ltr\">C\u00e2u 16: T\u00ednh \u0111\u1ed9 d\u00e0i c\u1ee7a c\u00e1c c\u1ea1nh c\u1ee7a ABCD h\u00ecnh thoi khi bi\u1ebft chu vi kim c\u01b0\u01a1ng l\u00e0 60cm.<\/p>\n<p dir=\"ltr\">C\u00e2u 17: T\u00ednh chi\u1ec1u d\u00e0i c\u1ee7a c\u00e1c c\u1ea1nh h\u00ecnh thoi khi bi\u1ebft chu vi h\u00ecnh thoi l\u00e0 40cm<\/p>\n<p dir=\"ltr\">C\u00e2u 18: Hai \u0111\u01b0\u1eddng ch\u00e9o c\u1ee7a h\u00ecnh thoi d\u00e0i 12cm v\u00e0 20 cm. T\u00ednh chu vi c\u1ee7a h\u00ecnh thoi.<\/p>\n<p dir=\"ltr\">C\u00e2u 19: T\u00ednh ABCD chu vi khi bi\u1ebft \u0111\u1ed9 d\u00e0i c\u1ea1nh l\u00e0 14 cm.<\/p>\n<p dir=\"ltr\">C\u00e2u 20: M\u1ed9t m\u1ea3nh \u0111\u1ea5t kim c\u01b0\u01a1ng c\u00f3 chi\u1ec1u d\u00e0i m\u1ed9t b\u00ean b\u1eb1ng 42m, m\u1ecdi ng\u01b0\u1eddi mu\u1ed1n h\u00e0ng r\u00e0o quanh v\u00f9ng \u0111\u1ea5t v\u1edbi 4 \u0111\u01b0\u1eddng d\u00e2y. H\u1ecfi c\u1ea7n bao nhi\u00eau m\u00e9t d\u00e2y th\u00e9p gai?<\/p>\n<h2 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Meo_de_giup_con_ban_thuc_hien_bai_tap_vi_mo_-Perimeteral\"><\/span>M\u1eb9o \u0111\u1ec3 gi\u00fap con b\u1ea1n th\u1ef1c hi\u1ec7n b\u00e0i t\u1eadp vi m\u00f4 -Perimeteral<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p dir=\"ltr\">\u0110\u1ec3 gi\u00fap c\u1ea3i thi\u1ec7n hi\u1ec7u qu\u1ea3 c\u1ee7a vi\u1ec7c h\u1ecdc v\u00e0 chinh ph\u1ee5c c\u00e1c lo\u1ea1i b\u00e0i t\u1eadp v\u1ec1 t\u00ednh to\u00e1n chu vi c\u1ee7a h\u00ecnh thoi, \u0111\u00e2y l\u00e0 m\u1ed9t s\u1ed1 m\u1eb9o m\u00e0 cha m\u1eb9 v\u00e0 tr\u1ebb em c\u00f3 th\u1ec3 \u00e1p d\u1ee5ng:<\/p>\n<h3 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Xay_dung_mot_nen_tang_va_niem_dam_me_toan_hoc_cho_tre_em_voi_toan_hoc_khi\"><\/span>X\u00e2y d\u1ef1ng m\u1ed9t n\u1ec1n t\u1ea3ng v\u00e0 ni\u1ec1m \u0111am m\u00ea to\u00e1n h\u1ecdc cho tr\u1ebb em v\u1edbi to\u00e1n h\u1ecdc kh\u1ec9<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p dir=\"ltr\">Shining Home &#8211; Gia \u0111\u00ecnh Anh Ng\u1eef Math l\u00e0 m\u1ed9t trong nh\u1eefng \u1ee9ng d\u1ee5ng to\u00e1n h\u1ecdc song ng\u1eef tr\u1ef1c tuy\u1ebfn v\u00e0 tr\u1ef1c tuy\u1ebfn cho tr\u1ebb m\u1eabu gi\u00e1o v\u00e0 ti\u1ec3u h\u1ecdc, \u0111\u01b0\u1ee3c ph\u00e1t tri\u1ec3n b\u1edfi kh\u1ec9 v\u1edbi n\u1ed9i dung c\u1ee7a ch\u01b0\u01a1ng tr\u00ecnh gi\u00e1o d\u1ee5c m\u1edbi nh\u1ea5t do B\u1ed9 Gi\u00e1o d\u1ee5c v\u00e0 \u0110\u00e0o t\u1ea1o, nh\u1eb1m ph\u00e1t tri\u1ec3n s\u1ef1 ph\u00e1t tri\u1ec3n to\u00e0n di\u1ec7n v\u1ec1 n\u0103ng l\u1ef1c h\u1ecdc t\u1eadp c\u1ee7a tr\u1ebb em theo c\u00e1ch t\u1ed1t nh\u1ea5t.<\/p>\n<p dir=\"ltr\">C\u00f9ng v\u1edbi \u0111\u00f3, Shining Home &#8211; Gia \u0111\u00ecnh Anh Ng\u1eef Math \u0111\u01b0\u1ee3c x\u00e2y d\u1ef1ng v\u1edbi m\u1ed9t h\u1ec7 th\u1ed1ng c\u00e1c b\u00e0i h\u1ecdc c\u00f3 h\u01a1n 400 n\u1ed9i dung, g\u1eafn b\u00f3 v\u1edbi h\u01a1n 60 ch\u1ee7 \u0111\u1ec1 to\u00e1n h\u1ecdc. C\u1ee5 th\u1ec3, ki\u1ebfn \u200b\u200bth\u1ee9c v\u1ec1 h\u00ecnh thoi l\u00e0 m\u1ed9t ph\u1ea7n c\u1ee7a ch\u1ee7 \u0111\u1ec1 h\u00ecnh h\u1ecdc, t\u1eadp trung v\u00e0o nghi\u00ean c\u1ee9u v\u00e0 gi\u1edbi thi\u1ec7u c\u00e1c b\u00e0i gi\u1ea3ng chuy\u00ean s\u00e2u v\u00e0 c\u00e1 nh\u00e2n h\u00f3a cho t\u1eebng \u0111\u1ed1i t\u01b0\u1ee3ng khi nghi\u00ean c\u1ee9u. Do \u0111\u00f3, th\u00f4ng qua \u1ee9ng d\u1ee5ng n\u00e0y, n\u00f3 \u0111\u01b0\u1ee3c d\u1ea1y d\u01b0\u1edbi d\u1ea1ng video, minh h\u1ecda h\u00e0i h\u01b0\u1edbc s\u1ebd gi\u00fap tr\u1ebb t\u0103ng kh\u1ea3 n\u0103ng h\u1ea5p th\u1ee5 v\u00e0 ghi nh\u1edb t\u1ed1t h\u01a1n thay v\u00ec ch\u1ec9 h\u1ecdc tr\u00ean s\u00e1ch.<\/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\/cach-tinh-chu-vi-hinh-thoi-3.jpg\" alt=\"D\u1ea1y con b\u1ea1n h\u1ecdc to\u00e1n theo ph\u01b0\u01a1ng ph\u00e1p t\u00edch c\u1ef1c v\u1edbi to\u00e1n h\u1ecdc kh\u1ec9. (\u1ea2nh: Kh\u1ec9)\" width=\"100%\"><\/p>\n<p dir=\"ltr\">K\u1ebft h\u1ee3p v\u1edbi \u0111i\u1ec1u \u0111\u00f3, \u1ee9ng d\u1ee5ng c\u0169ng ph\u00e1t tri\u1ec3n h\u01a1n 10.000 ho\u1ea1t \u0111\u1ed9ng t\u01b0\u01a1ng t\u00e1c, \u0111\u1ec3 em b\u00e9 v\u1eeba h\u1ecdc v\u00e0 ch\u01a1i, \u0111\u01b0\u1ee3c h\u1ed7 tr\u1ee3 \u0111\u1ec3 t\u0103ng c\u01b0\u1eddng kh\u1ea3 n\u0103ng quan s\u00e1t, t\u00ednh to\u00e1n v\u00e0 ngh\u0129 v\u1ec1 em b\u00e9 ph\u00e1t tri\u1ec3n h\u01a1n.<\/p>\n<p dir=\"ltr\">\u0110\u1eb7c bi\u1ec7t, m\u1ed7i b\u00e0i h\u1ecdc \u0111\u01b0\u1ee3c t\u1ed1i \u01b0u h\u00f3a trong kho\u1ea3ng 15-20 ph\u00fat. H\u00e3y ch\u1eafc ch\u1eafn r\u1eb1ng em b\u00e9 c\u1ee7a b\u1ea1n hi\u1ec3u ki\u1ebfn \u200b\u200bth\u1ee9c c\u1ee7a ch\u00fang v\u00e0 tr\u00e1nh t\u1ea7m nh\u00ecn c\u1ee7a em b\u00e9. Ngo\u00e0i ra, Shining Home &#8211; Gia \u0111\u00ecnh Anh Ng\u1eef c\u0169ng ph\u00e1t tri\u1ec3n nhi\u1ec1u t\u00ednh n\u0103ng h\u01a1n cho ph\u1ee5 huynh \u0111\u1ec3 qu\u1ea3n l\u00fd c\u00e1c b\u00e0i h\u1ecdc c\u1ee7a h\u1ecd m\u1ed9t c\u00e1ch hi\u1ec7u qu\u1ea3.<\/p>\n<p dir=\"ltr\">Ch\u1ec9 v\u1edbi 2000 VND\/ng\u00e0y, nh\u01b0ng c\u00e1c gi\u00e1 tr\u1ecb m\u00e0 Shining Home &#8211; Gia \u0111\u00ecnh Anh Ng\u1eef Math mang \u0111\u1ebfn cho s\u1ef1 ph\u00e1t tri\u1ec3n c\u1ee7a tr\u1ebb em l\u00e0 r\u1ea5t l\u1edbn. H\u1ed7 tr\u1ee3 \u0111\u1ec3 gi\u00fap x\u00e2y d\u1ef1ng m\u1ed9t n\u1ec1n t\u1ea3ng to\u00e1n h\u1ecdc t\u1eeb m\u1ed9t em b\u00e9 nh\u1ecf, t\u0103ng kh\u1ea3 n\u0103ng suy ngh\u0129 v\u00e0 ng\u00f4n ng\u1eef khi tr\u1ebb h\u1ecdc c\u0169ng \u0111\u1ea1t \u0111\u01b0\u1ee3c k\u1ebft qu\u1ea3 t\u1ed1t h\u01a1n.<\/p>\n<p dir=\"ltr\" style=\"text-align: center\"><img loading=\"lazy\" decoding=\"async\" class=\"lazyload\" src=\"https:\/\/external-content.duckduckgo.com\/iu\/?u=https:\/\/vnmedia.monkeyuni.net\/upload\/web\/img\/nhantuvanmienphi.png\" alt=\"\" width=\"300\" height=\"59\"><\/p>\n<p dir=\"ltr\" style=\"text-align: center\"><a href=\"https:\/\/www.youtube.com\/watch?v=7DSJPVHFROS\" target=\"_blank\" rel=\"noopener\">https:\/\/www.youtube.com\/watch?v=7DSJPVHFROS<\/a><\/p>\n<h3 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Ho_tro_va_cung_co_kien_%E2%80%8B%E2%80%8Bthuc_co_ban_ve_hinh_thoi_cho_tre_em\"><\/span>H\u1ed7 tr\u1ee3 v\u00e0 c\u1ee7ng c\u1ed1 ki\u1ebfn \u200b\u200bth\u1ee9c c\u01a1 b\u1ea3n v\u1ec1 h\u00ecnh thoi cho tr\u1ebb em<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p dir=\"ltr\">\u0110\u1ec3 gi\u1ea3i quy\u1ebft c\u00e1c b\u00e0i t\u1eadp c\u1ee7a chu vi h\u00ecnh thoi, n\u00f3 \u0111\u00f2i h\u1ecfi tr\u1ebb ph\u1ea3i l\u00e0m ch\u1ee7 c\u00e1c ki\u1ebfn \u200b\u200bth\u1ee9c c\u01a1 b\u1ea3n nh\u01b0 \u0111\u1eb7c \u0111i\u1ec3m, thu\u1ed9c t\u00ednh h\u00ecnh thoi, c\u00f4ng th\u1ee9c t\u00ednh to\u00e1n &#8230; cha m\u1eb9 n\u00ean th\u01b0\u1eddng xuy\u00ean ki\u1ec3m tra ki\u1ebfn \u200b\u200bth\u1ee9c c\u0169 c\u1ee7a ch\u00fang, n\u1ebfu ch\u00fang qu\u00ean ho\u1eb7c kh\u00f4ng hi\u1ec3u ph\u1ea7n n\u00e0o, c\u1ea7n ph\u1ea3i t\u0103ng c\u01b0\u1eddng ngay l\u1eadp t\u1ee9c \u0111\u1ec3 tr\u00e1nh h\u1ecdc ng\u00e0y c\u00e0ng kh\u00f3 kh\u0103n h\u01a1n.<\/p>\n<h3 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Thuc_hanh_thuc_hanh_thuong_xuyen\"><\/span>Th\u1ef1c h\u00e0nh, th\u1ef1c h\u00e0nh th\u01b0\u1eddng xuy\u00ean<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p dir=\"ltr\">H\u1ecdc t\u1eadp \u0111i \u0111\u00f4i v\u1edbi lu\u00f4n lu\u00f4n \u0111\u00fang trong m\u1ecdi t\u00ecnh hu\u1ed1ng. V\u00ec v\u1eady, sau khi em b\u00e9 \u0111\u00e3 n\u1eafm b\u1eaft \u0111\u01b0\u1ee3c c\u00e1c c\u00f4ng th\u1ee9c chu vi c\u1ee7a h\u00ecnh thoi, ki\u1ebfn \u200b\u200bth\u1ee9c c\u01a1 b\u1ea3n li\u00ean quan \u0111\u1ebfn &#8230; cha m\u1eb9 n\u00ean khuy\u1ebfn kh\u00edch v\u00e0 khuy\u1ebfn kh\u00edch con c\u00e1i h\u1ecd th\u1ef1c h\u00e0nh v\u00e0 th\u1ef1c h\u00e0nh nhi\u1ec1u h\u01a1n. V\u00ed d\u1ee5, gi\u1ea3i quy\u1ebft c\u00e1c b\u00e0i t\u1eadp trong s\u00e1ch gi\u00e1o khoa, b\u00e0i t\u1eadp, tham kh\u1ea3o ki\u1ebfn \u200b\u200bth\u1ee9c n\u00e2ng cao m\u1edbi h\u01a1n tr\u00ean internet, gi\u1ea3i ph\u00e1p thi, v.v &#8230; Th\u1ef1c h\u00e0nh th\u01b0\u1eddng xuy\u00ean s\u1ebd gi\u00fap t\u0103ng kh\u1ea3 n\u0103ng suy ngh\u0129, ghi nh\u1edb v\u00e0 ti\u1ebfp thu tr\u1ebb em t\u1ed1t h\u01a1n.<\/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\/cach-tinh-chu-vi-hinh-thoi-4.jpg\" alt=\"Cha m\u1eb9 n\u00ean khuy\u1ebfn kh\u00edch con c\u00e1i th\u1ef1c h\u00e0nh v\u00e0 th\u1ef1c h\u00e0nh th\u01b0\u1eddng xuy\u00ean. (\u1ea2nh: B\u1ed9 s\u01b0u t\u1eadp Internet)\" width=\"100%\"><\/p>\n<h3 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Tim_hieu_cong_thuc_chu_vi_hinh_thoi_thong_qua_tho\"><\/span>T\u00ecm hi\u1ec3u c\u00f4ng th\u1ee9c chu vi h\u00ecnh thoi th\u00f4ng qua th\u01a1<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p dir=\"ltr\">\u0110\u1ec3 gi\u00fap h\u1ecd d\u1ec5 d\u00e0ng ghi nh\u1edb c\u00f4ng th\u1ee9c t\u00ednh to\u00e1n c\u00e1c h\u00ecnh \u1ea3nh, nhi\u1ec1u gi\u00e1o vi\u00ean \u0111\u00e3 ngh\u0129 ra nh\u1eefng &#8220;b\u00e0i th\u01a1&#8221; th\u00fa v\u1ecb. C\u1ee5 th\u1ec3, v\u1edbi h\u00ecnh thoi, h\u1ecd c\u00f3 th\u1ec3 nh\u1edb b\u00e0i th\u01a1 sau:<\/p>\n<p dir=\"ltr\" style=\"text-align: center\"><em>\u201cKhu v\u1ef1c kim c\u01b0\u01a1ng s\u1ebd<\/em><\/p>\n<p dir=\"ltr\" style=\"text-align: center\"><em>Hai \u0111\u01b0\u1eddng ch\u00e9o \u0111\u01b0\u1ee3c chia th\u00e0nh hai ph\u1ea7n.<\/em><\/p>\n<p dir=\"ltr\" style=\"text-align: center\"><em>Chu vi g\u1ea5p b\u1ed1n l\u1ea7n g\u1ea5p.<\/em><\/p>\n<p dir=\"ltr\" style=\"text-align: center\"><em>S\u1ebd ra k\u1ebft qu\u1ea3 \u0111\u00fang. &#8220;<\/em><\/p>\n<h2 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Mot_so_ghi_chu_khi_tinh_chu_vi_hinh_thoi\"><\/span>M\u1ed9t s\u1ed1 ghi ch\u00fa khi t\u00ednh chu vi h\u00ecnh thoi<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p dir=\"ltr\">Trong qu\u00e1 tr\u00ecnh d\u1ea1y tr\u1ebb h\u1ecdc t\u00ednh to\u00e1n to\u00e1n h\u1ecdc c\u1ee7a chu vi c\u1ee7a h\u00ecnh thoi, \u0111i\u1ec1u quan tr\u1ecdng c\u1ea7n l\u01b0u \u00fd l\u00e0 m\u1ed9t s\u1ed1 \u0111i\u1ec3m sau:<\/p>\n<ul>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">C\u1ea7n \u0111\u1ecdc v\u1ea5n \u0111\u1ec1 m\u1ed9t c\u00e1ch c\u1ea9n th\u1eadn, \u0111\u1ec3 bi\u1ebft v\u1ea5n \u0111\u1ec1 cho s\u1ef1 th\u1eadt? N\u1eafm b\u1eaft nh\u1eefng g\u00ec?<\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">Sau khi th\u1ef1c hi\u1ec7n b\u00e0i ki\u1ec3m tra, c\u1ea7n ph\u1ea3i xem l\u1ea1i b\u00e0i h\u1ecdc m\u1ed9t c\u00e1ch c\u1ea9n th\u1eadn \u0111\u1ec3 tr\u00e1nh l\u1ed7i<\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">H\u00e3y ch\u00fa \u00fd \u0111\u1ebfn \u0111\u01a1n v\u1ecb \u0111o c\u00e1c c\u1ea1nh, chu vi trong h\u00ecnh, n\u1ebfu thi\u1ebft b\u1ecb ph\u1ea3i \u0111\u01b0\u1ee3c chuy\u1ec3n \u0111\u1ed5i th\u00e0nh c\u00f9ng m\u1ed9t \u0111\u01a1n v\u1ecb.<\/p>\n<\/li>\n<\/ul>\n<table style=\"border-collapse: collapse;width: 100%;background-color: #fbeeb8\" border=\"1\">\n<tr>\n<td style=\"width: 98.5189%\">\n<p style=\"text-align: center\">Gi\u00fap con b\u1ea1n t\u1ef1 tin n\u00f3i v\u00e0 giao ti\u1ebfp b\u1eb1ng ti\u1ebfng Anh ch\u1ec9 sau 3 th\u00e1ng \u1edf nh\u00e0 ch\u1ec9 v\u1edbi 2000 VND\/ng\u00e0y v\u1edbi nh\u1eefng c\u00e2u chuy\u1ec7n v\u1ec1 kh\u1ec9 &#8211; \u1ee9ng d\u1ee5ng h\u00e0ng \u0111\u1ea7u c\u1ee7a vi\u1ec7c d\u1ea1y ti\u1ebfng Anh tr\u1ef1c tuy\u1ebfn v\u1edbi h\u01a1n 10 tri\u1ec7u ph\u1ee5 huynh tin t\u01b0\u1edfng.<\/p>\n<p style=\"text-align: center\">\n<p><img loading=\"lazy\" decoding=\"async\" style=\"margin-left: auto;margin-right: auto\" class=\"lazyload\" src=\"https:\/\/external-content.duckduckgo.com\/iu\/?u=https:\/\/vnmedia2.monkeyuni.net\/upload\/web\/img\/timhieungay.png\" alt=\"\" width=\"200\" height=\"41\"><\/p>\n<\/td>\n<\/tr>\n<\/table>\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 m\u1ed9t b\u1ea3n t\u00f3m t\u1eaft c\u00e1c ki\u1ebfn \u200b\u200bth\u1ee9c c\u01a1 b\u1ea3n nh\u1ea5t v\u1ec1 t\u00ednh to\u00e1n chu vi h\u00ecnh thoi. Do \u0111\u00f3, \u00e1nh n\u1eafng m\u1eb7t tr\u1eddi c\u1ee7a c\u00e1c n\u1ec1n t\u1ea3ng c\u01a1 b\u1ea3n n\u00e0y s\u1ebd h\u1ed7 tr\u1ee3 vi\u1ec7c h\u1ecdc ki\u1ebfn \u200b\u200bth\u1ee9c n\u00e2ng cao v\u1ec1 em b\u00e9 hi\u1ec7u qu\u1ea3 h\u01a1n. Do \u0111\u00f3, ph\u1ee5 huynh, h\u00e3y h\u1ecdc, h\u1ecdc t\u1eadp v\u00e0 \u00e1p d\u1ee5ng c\u00e1c b\u00ed m\u1eadt tr\u00ean \u0111\u1ec3 h\u1ed7 tr\u1ee3 vi\u1ec7c h\u1ecdc c\u1ee7a em b\u00e9 \u0111\u1ec3 \u0111\u1ea1t \u0111\u01b0\u1ee3c k\u1ebft qu\u1ea3 t\u1ed1t nh\u1ea5t.<\/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>Chu vi h\u00ecnh thoi s\u1ebd b\u1eb1ng chi\u1ec1u d\u00e0i c\u1ee7a c\u00e1c \u0111\u01b0\u1eddng xung quanh h\u00ecnh \u1ea3nh ho\u1eb7c \u0111\u01b0\u1eddng bao quanh to\u00e0n b\u1ed9 khu v\u1ef1c. \u0110\u1ec3 c\u00f3 th\u1ec3 t\u00ednh to\u00e1n chu vi c\u1ee7a h\u00ecnh thoi chi ti\u1ebft, ch\u00fang ta c\u1ea7n ph\u1ea3i c\u00f3 m\u1ed9t c\u00f4ng th\u1ee9c c\u1ee5 th\u1ec3. H\u00e0ng tri\u1ec7u tr\u1ebb em \u0111\u00e3 ph\u00e1t tri\u1ec3n c\u00e1c k\u1ef9 n\u0103ng&#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-15163","post","type-post","status-publish","format-standard","hentry","category-kien-thuc"],"_links":{"self":[{"href":"https:\/\/www.ckconitsha.com\/vn\/wp-json\/wp\/v2\/posts\/15163","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=15163"}],"version-history":[{"count":2,"href":"https:\/\/www.ckconitsha.com\/vn\/wp-json\/wp\/v2\/posts\/15163\/revisions"}],"predecessor-version":[{"id":22062,"href":"https:\/\/www.ckconitsha.com\/vn\/wp-json\/wp\/v2\/posts\/15163\/revisions\/22062"}],"wp:attachment":[{"href":"https:\/\/www.ckconitsha.com\/vn\/wp-json\/wp\/v2\/media?parent=15163"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ckconitsha.com\/vn\/wp-json\/wp\/v2\/categories?post=15163"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ckconitsha.com\/vn\/wp-json\/wp\/v2\/tags?post=15163"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}