{"id":15161,"date":"2025-07-01T08:40:03","date_gmt":"2025-07-01T01:40:03","guid":{"rendered":"https:\/\/www.ckconitsha.com\/vn\/?p=15161"},"modified":"2025-07-01T10:05:23","modified_gmt":"2025-07-01T03:05:23","slug":"cong-thuc-tinh-dien-tich-hinh-thoi-va-huong-dan-giai-bai-tap-chi-tiet","status":"publish","type":"post","link":"https:\/\/www.ckconitsha.com\/vn\/cong-thuc-tinh-dien-tich-hinh-thoi-va-huong-dan-giai-bai-tap-chi-tiet\/","title":{"rendered":"C\u00f4ng th\u1ee9c t\u00ednh di\u1ec7n t\u00edch 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-dien-tich-hinh-thoi-va-huong-dan-giai-bai-tap-chi-tiet\/#Cong_thuc_tinh_toan_dien_tich_hinh_thoi\" >C\u00f4ng th\u1ee9c t\u00ednh to\u00e1n di\u1ec7n t\u00edch h\u00ecnh thoi<\/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-dien-tich-hinh-thoi-va-huong-dan-giai-bai-tap-chi-tiet\/#Mot_so_loai_bai_tap_tinh_toan_khu_vuc_hinh_thoi_chung\" >M\u1ed9t s\u1ed1 lo\u1ea1i b\u00e0i t\u1eadp t\u00ednh to\u00e1n khu v\u1ef1c h\u00ecnh thoi chung<\/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-dien-tich-hinh-thoi-va-huong-dan-giai-bai-tap-chi-tiet\/#Cach_tinh_dien_tich_hinh_thoi_cheo_duong_cheo\" >C\u00e1ch t\u00ednh di\u1ec7n t\u00edch h\u00ecnh thoi ch\u00e9o \u0111\u01b0\u1eddng ch\u00e9o<\/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-dien-tich-hinh-thoi-va-huong-dan-giai-bai-tap-chi-tiet\/#Cach_tinh_dien_tich_hinh_thoi_dua_tren_chieu_cao_va_canh_duoi\" >C\u00e1ch t\u00ednh di\u1ec7n t\u00edch h\u00ecnh thoi d\u1ef1a tr\u00ean chi\u1ec1u cao v\u00e0 c\u1ea1nh d\u01b0\u1edbi<\/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-dien-tich-hinh-thoi-va-huong-dan-giai-bai-tap-chi-tiet\/#Cach_tinh_dien_tich_hinh_thoi_dua_tren_cac_cong_thuc_luong_giac\" >C\u00e1ch t\u00ednh di\u1ec7n t\u00edch h\u00ecnh thoi d\u1ef1a tr\u00ean c\u00e1c c\u00f4ng th\u1ee9c l\u01b0\u1ee3ng gi\u00e1c<\/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-dien-tich-hinh-thoi-va-huong-dan-giai-bai-tap-chi-tiet\/#Tap_the_duc_tren_khu_vuc_cua_hinh_thoi_de_em_be_cua_ban_luyen_tap\" >T\u1eadp th\u1ec3 d\u1ee5c tr\u00ean khu v\u1ef1c c\u1ee7a h\u00ecnh thoi \u0111\u1ec3 em b\u00e9 c\u1ee7a b\u1ea1n 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-7\" href=\"https:\/\/www.ckconitsha.com\/vn\/cong-thuc-tinh-dien-tich-hinh-thoi-va-huong-dan-giai-bai-tap-chi-tiet\/#Meo_de_giup_con_ban_lam_mot_khu_vuc_hinh_thoi_hieu_qua\" >M\u1eb9o \u0111\u1ec3 gi\u00fap con b\u1ea1n l\u00e0m m\u1ed9t khu v\u1ef1c h\u00ecnh thoi 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-8\" href=\"https:\/\/www.ckconitsha.com\/vn\/cong-thuc-tinh-dien-tich-hinh-thoi-va-huong-dan-giai-bai-tap-chi-tiet\/#Tao_niem_dam_me_va_phan_khich_cho_tre_em_voi_toan_hoc_khi\" >T\u1ea1o ni\u1ec1m \u0111am m\u00ea v\u00e0 ph\u1ea5n kh\u00edch 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-dien-tich-hinh-thoi-va-huong-dan-giai-bai-tap-chi-tiet\/#Lam_chu_kien_%E2%80%8B%E2%80%8Bthuc_co_ban_ve_hinh_hoc_va_hinh_thoi\" >L\u00e0m ch\u1ee7 ki\u1ebfn \u200b\u200bth\u1ee9c c\u01a1 b\u1ea3n v\u1ec1 h\u00ecnh h\u1ecdc v\u00e0 h\u00ecnh thoi<\/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-dien-tich-hinh-thoi-va-huong-dan-giai-bai-tap-chi-tiet\/#Nghien_cuu_song_song_voi_hanh_tay\" >Nghi\u00ean c\u1ee9u song song v\u1edbi h\u00e0nh t\u00e2y<\/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-dien-tich-hinh-thoi-va-huong-dan-giai-bai-tap-chi-tiet\/#Hoc_toan_hoc_hinh_thoi_thong_qua_thuc_hanh\" >H\u1ecdc to\u00e1n h\u1ecdc h\u00ecnh thoi th\u00f4ng qua th\u1ef1c h\u00e0nh<\/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-dien-tich-hinh-thoi-va-huong-dan-giai-bai-tap-chi-tiet\/#Mot_so_ghi_chu_khi_tinh_toan_dien_tich_hinh_thoi\" >M\u1ed9t s\u1ed1 ghi ch\u00fa khi t\u00ednh to\u00e1n di\u1ec7n t\u00edch 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-dien-tich-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>C\u00f4ng th\u1ee9c t\u00ednh to\u00e1n di\u1ec7n t\u00edch kim c\u01b0\u01a1ng \u0111\u01b0\u1ee3c t\u00ednh theo m\u1ed9t n\u1eeda chi\u1ec1u d\u00e0i ch\u00e9o, c\u00f9ng v\u1edbi vi\u1ec7c h\u1ecd c\u1ea7n hi\u1ec3u c\u00e1c lo\u1ea1i b\u00e0i t\u1eadp li\u00ean quan, gi\u1ea3i ph\u00e1p \u0111\u1ec3 chinh ph\u1ee5c c\u00e1c b\u00e0i t\u1eadp hi\u1ec7u qu\u1ea3. T\u1ea5t c\u1ea3 s\u1ebd \u0111\u01b0\u1ee3c chi ti\u1ebft b\u1edfi Shining Home &#8211; Gia \u0111\u00ecnh Anh Ng\u1eef trong b\u00e0i vi\u1ebft sau \u0111\u00e2y.<\/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\">Kim c\u01b0\u01a1ng l\u00e0 m\u1ed9t h\u00ecnh 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 di\u1ec7n t\u00edch 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_dien_tich_hinh_thoi\"><\/span>C\u00f4ng th\u1ee9c t\u00ednh to\u00e1n di\u1ec7n t\u00edch h\u00ecnh thoi<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p dir=\"ltr\">V\u00f9ng h\u00ecnh thoi l\u00e0 m\u1eb7t ph\u1eb3ng c\u1ee7a h\u00ecnh \u1ea3nh ch\u00fang ta th\u1ea5y, ch\u00fang \u0111\u01b0\u1ee3c t\u00ednh b\u1eb1ng m\u1ed9t n\u1eeda c\u00f4ng th\u1ee9c c\u1ee7a hai \u0111\u01b0\u1eddng ch\u00e9o.<\/p>\n<p dir=\"ltr\">V\u00ec v\u1eady, v\u1edbi m\u1ed9t ABCD h\u00ecnh thoi, ch\u00fang t\u00f4i s\u1ebd c\u00f3 c\u00f4ng th\u1ee9c t\u00ednh to\u00e1n di\u1ec7n t\u00edch kim c\u01b0\u01a1ng l\u00e0:<\/p>\n<p dir=\"ltr\" style=\"text-align: center\">S = \u00bd x (d1 x d2) ho\u1eb7c s = hx a.<\/p>\n<p dir=\"ltr\">Trong \u0111\u00f3:<\/p>\n<ul>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">S: l\u00e0 khu v\u1ef1c c\u1ee7a h\u00ecnh thoi<\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">D1 v\u00e0 D2: \u0110\u01b0\u1eddng ch\u00e9o theo \u0111\u01b0\u1eddng ch\u00e9o.<\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">H: Chi\u1ec1u cao c\u1ee7a h\u00ecnh thoi.<\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">A: c\u1ea1nh h\u00ecnh thoi<\/p>\n<\/li>\n<\/ul>\n<p dir=\"ltr\"><img decoding=\"async\" class=\"lazyload\" src=\"https:\/\/external-content.duckduckgo.com\/iu\/?u=https:\/\/vnmedia2.monkeyuni.net\/upload\/web\/img\/cong-thuc-tinh-dien-tich-hinh-thoi-1.jpg\" alt=\"C\u00f4ng th\u1ee9c t\u00ednh to\u00e1n di\u1ec7n t\u00edch c\u1ee7a h\u00ecnh thoi. (\u1ea2nh: B\u1ed9 s\u01b0u t\u1eadp Internet)\" width=\"100%\"><\/p>\n<p dir=\"ltr\"><em>V\u00ed d\u1ee5: C\u00f3 m\u1ed9t con di\u1ec1u h\u00ecnh thoi, v\u1edbi hai \u0111\u01b0\u1eddng ch\u00e9o giao v\u1edbi chi\u1ec1u d\u00e0i t\u01b0\u01a1ng \u1ee9ng 6cm v\u00e0 8cm. H\u1ecfi bao nhi\u00eau t\u00e3 c\u1ee7a con di\u1ec1u h\u00ecnh thoi?<\/em><\/p>\n<p dir=\"ltr\"><em>\u0110\u01b0\u1ee3c \u00e1p d\u1ee5ng b\u1eb1ng c\u00e1ch t\u00ednh di\u1ec7n t\u00edch h\u00ecnh thoi, ch\u00fang ta c\u00f3 d1 = 6cm v\u00e0 d2 = 8cm. Suy ra, khu v\u1ef1c c\u1ee7a di\u1ec1u h\u00ecnh thoi s\u1ebd b\u1eb1ng v\u1edbi:<\/em><\/p>\n<p dir=\"ltr\"><em>S = \u00bd x (d1xd2) = 1\/2 x (6 \u00d7 8) = 1\/2 x 48 = 24 cm2<\/em><\/p>\n<h2 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Mot_so_loai_bai_tap_tinh_toan_khu_vuc_hinh_thoi_chung\"><\/span>M\u1ed9t s\u1ed1 lo\u1ea1i b\u00e0i t\u1eadp t\u00ednh to\u00e1n khu v\u1ef1c h\u00ecnh thoi chung<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p dir=\"ltr\">D\u1ef1a tr\u00ean c\u00f4ng th\u1ee9c khu v\u1ef1c h\u00ecnh thoi \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh b\u1edfi m\u1ed9t n\u1eeda \u0111\u01b0\u1eddng ch\u00e9o. Ch\u00fang ta c\u00f3 th\u1ec3 suy lu\u1eadn r\u1eb1ng c\u00f3 nhi\u1ec1u lo\u1ea1i b\u00e0i t\u1eadp kh\u00e1c nhau \u0111\u01b0\u1ee3c \u0111\u01b0a ra \u0111\u1ec3 h\u1ecd h\u1ecdc v\u00e0 chinh ph\u1ee5c. Bao g\u1ed3m:<\/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\/cong-thuc-tinh-dien-tich-hinh-thoi-2.jpg\" alt=\"C\u00f3 nhi\u1ec1u lo\u1ea1i b\u00e0i t\u1eadp khu v\u1ef1c h\u00ecnh thoi \u0111\u1ec3 tr\u1ebb th\u1ef1c h\u00e0nh. (\u1ea2nh: B\u1ed9 s\u01b0u t\u1eadp Internet)\" width=\"100%\"><\/p>\n<h3 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Cach_tinh_dien_tich_hinh_thoi_cheo_duong_cheo\"><\/span>C\u00e1ch t\u00ednh di\u1ec7n t\u00edch h\u00ecnh thoi ch\u00e9o \u0111\u01b0\u1eddng ch\u00e9o<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>C\u00f4ng th\u1ee9c t\u00ednh to\u00e1n kim c\u01b0\u01a1ng khi bi\u1ebft \u0111\u01b0\u1eddng ch\u00e9o: s = (\u0111\u01b0\u1eddng ch\u00e9o ch\u00e9o ch\u00e9o 2) \/ 2. Chi ti\u1ebft t\u00ednh to\u00e1n nh\u01b0 sau:<\/p>\n<p dir=\"ltr\">Gi\u1ea3i ph\u00e1p: Ch\u00fang t\u00f4i \u00e1p d\u1ee5ng c\u00f4ng th\u1ee9c ch\u00ednh x\u00e1c \u0111\u1ec3 t\u00ednh di\u1ec7n t\u00edch h\u00ecnh thoi b\u1eb1ng c\u00e1ch l\u1ea5y hai \u0111\u01b0\u1eddng ch\u00e9o v\u00e0 sau \u0111\u00f3 chia cho 2.<\/p>\n<p dir=\"ltr\">\u0110\u1ec3 t\u00ednh di\u1ec7n t\u00edch c\u1ee7a c\u01a1 s\u1edf ch\u00e9o, ch\u00fang t\u00f4i l\u00e0m theo c\u00e1c b\u01b0\u1edbc sau:<\/p>\n<ul>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">B\u01b0\u1edbc 1: X\u00e1c \u0111\u1ecbnh \u0111\u1ed9 d\u00e0i v\u00e0 k\u00edch th\u01b0\u1edbc c\u1ee7a hai \u0111\u01b0\u1eddng ch\u00e9o \u0111\u01b0\u1eddng ch\u00e9o<\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">B\u01b0\u1edbc 2: Ti\u1ebfn h\u00e0nh nh\u00e2n v\u1edbi hai chi\u1ec1u d\u00e0i ch\u00e9o v\u1edbi nhau.<\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">B\u01b0\u1edbc 3: Chia hai \u0111\u01b0\u1eddng ch\u00e9o cho 2 s\u1ebd l\u00e0 k\u1ebft qu\u1ea3 c\u1ee7a m\u1ed9t khu v\u1ef1c h\u00ecnh thoi.<\/p>\n<\/li>\n<\/ul>\n<h3 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Cach_tinh_dien_tich_hinh_thoi_dua_tren_chieu_cao_va_canh_duoi\"><\/span>C\u00e1ch t\u00ednh di\u1ec7n t\u00edch h\u00ecnh thoi d\u1ef1a tr\u00ean chi\u1ec1u cao v\u00e0 c\u1ea1nh d\u01b0\u1edbi<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>L\u00e0m th\u1ebf n\u00e0o \u0111\u1ec3 di\u1ec7n t\u00edch h\u00ecnh thoi t\u00ednh to\u00e1n khi bi\u1ebft chi\u1ec1u cao v\u00e0 c\u1ea1nh d\u01b0\u1edbi? H\u00e3y t\u00ecm ra gi\u1ea3i ph\u00e1p sau:<\/p>\n<p dir=\"ltr\">Ph\u01b0\u01a1ng ph\u00e1p gi\u1ea3i quy\u1ebft: H\u00ecnh thoi c\u00f3 c\u00e1c thu\u1ed9c t\u00ednh \u0111\u1ea7y \u0111\u1ee7 c\u1ee7a t\u1ee9 gi\u00e1c \u0111\u1eb7c bi\u1ec7t, s\u1edf h\u1eefu hai c\u1ea1nh v\u00e0 ph\u1ea7n d\u01b0\u1edbi b\u1eb1ng nhau. V\u00ec v\u1eady, v\u1edbi d\u1ea1ng to\u00e1n h\u1ecdc cho chi\u1ec1u cao v\u00e0 c\u1ea1nh d\u01b0\u1edbi, ch\u00fang ta c\u00f3 th\u1ec3 \u00e1p d\u1ee5ng c\u00f4ng th\u1ee9c sau \u0111\u1ec3 t\u00ednh di\u1ec7n t\u00edch h\u00ecnh thoi: s = (a + a) xh\/2 = axh <\/p>\n<p dir=\"ltr\">Trong \u0111\u00f3:  <\/p>\n<ul>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">S: Bi\u1ec3u t\u01b0\u1ee3ng c\u1ee7a m\u1ed9t khu v\u1ef1c h\u00ecnh thoi<\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">A: Chi\u1ec1u d\u00e0i c\u1ea1nh c\u1ee7a h\u00ecnh thoi<\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">H: Chi\u1ec1u cao c\u1ee7a kim c\u01b0\u01a1ng<\/p>\n<\/li>\n<\/ul>\n<p dir=\"ltr\">C\u00e1c b\u01b0\u1edbc nh\u01b0 sau:<\/p>\n<ul>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">B\u01b0\u1edbc 1: X\u00e1c \u0111\u1ecbnh chi\u1ec1u d\u00e0i c\u1ee7a chi\u1ec1u cao v\u00e0 c\u1ea1nh d\u01b0\u1edbi c\u1ee7a h\u00ecnh thoi. <\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">B\u01b0\u1edbc 2: L\u1ea5y chi\u1ec1u d\u00e0i c\u1ee7a chi\u1ec1u cao c\u1ee7a h\u1ea1t nh\u00e2n v\u1edbi chi\u1ec1u d\u00e0i c\u1ee7a c\u1ea1nh d\u01b0\u1edbi. <\/p>\n<\/li>\n<\/ul>\n<h3 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Cach_tinh_dien_tich_hinh_thoi_dua_tren_cac_cong_thuc_luong_giac\"><\/span>C\u00e1ch t\u00ednh di\u1ec7n t\u00edch h\u00ecnh thoi d\u1ef1a tr\u00ean c\u00e1c c\u00f4ng th\u1ee9c l\u01b0\u1ee3ng gi\u00e1c <span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p dir=\"ltr\">Gi\u1ea3i ph\u00e1p: H\u00e3y xem x\u00e9t h\u00ecnh thoi ABCD v\u00e0 g\u1ecdi chi\u1ec1u d\u00e0i c\u1ea1nh c\u1ee7a h\u00ecnh thoi a. T\u1ea1i th\u1eddi \u0111i\u1ec3m n\u00e0y, \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh di\u1ec7n t\u00edch c\u1ee7a ABCD Rhombus, ch\u00fang ta ch\u1ec9 c\u1ea7n \u00e1p d\u1ee5ng c\u00f4ng th\u1ee9c sau:<\/p>\n<p dir=\"ltr\" style=\"text-align: center\">S = a\u00b2. t\u1ed9i l\u1ed7i \u03b1. <\/p>\n<p dir=\"ltr\">Trong \u0111\u00f3:  <\/p>\n<p dir=\"ltr\">S: Bi\u1ec3u t\u01b0\u1ee3ng c\u1ee7a m\u1ed9t khu v\u1ef1c h\u00ecnh thoi<\/p>\n<p dir=\"ltr\">A: K\u00edch th\u01b0\u1edbc c\u1ee7a chi\u1ec1u d\u00e0i b\u00ean<\/p>\n<p dir=\"ltr\">\u03b1: \u0110o b\u1ea5t k\u1ef3 g\u00f3c n\u00e0o c\u1ee7a h\u00ecnh thoi. <\/p>\n<p dir=\"ltr\">\n<h2 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Tap_the_duc_tren_khu_vuc_cua_hinh_thoi_de_em_be_cua_ban_luyen_tap\"><\/span>T\u1eadp th\u1ec3 d\u1ee5c tr\u00ean khu v\u1ef1c c\u1ee7a h\u00ecnh thoi \u0111\u1ec3 em b\u00e9 c\u1ee7a b\u1ea1n luy\u1ec7n t\u1eadp<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p dir=\"ltr\">D\u01b0\u1edbi \u0111\u00e2y l\u00e0 m\u1ed9t s\u1ed1 b\u00e0i t\u1eadp li\u00ean quan \u0111\u1ebfn kh\u00f4ng gian c\u1ee7a h\u00ecnh thoi \u0111\u1ec3 tr\u1ebb th\u1ef1c h\u00e0nh c\u00f9ng nhau:<\/p>\n<p dir=\"ltr\">B\u00e0i 1: T\u00ednh di\u1ec7n t\u00edch c\u1ee7a h\u00ecnh thoi bi\u1ebft c\u1ea1nh d\u01b0\u1edbi c\u1ee7a n\u00f3 l\u00e0 10 cm v\u00e0 chi\u1ec1u cao l\u00e0 7 cm. <\/p>\n<p dir=\"ltr\">B\u00e0i 2: Cung c\u1ea5p cho ABCD h\u00ecnh thoi v\u1edbi c\u1ea1nh 13cm, hai \u0111\u01b0\u1eddng ch\u00e9o giao nhau t\u1ea1i H. T\u00ednh di\u1ec7n t\u00edch c\u1ee7a h\u00ecnh thoi ABCD bi\u1ebft BH l\u00e0 n\u1eeda l\u1ea7n ah. <\/p>\n<p dir=\"ltr\">B\u00e0i 3: T\u00ednh di\u1ec7n t\u00edch c\u1ee7a h\u00ecnh thoi bi\u1ebft \u0111\u1ed9 d\u00e0i c\u1ea1nh l\u00e0 17cm v\u00e0 m\u1ed9t trong c\u00e1c \u0111\u01b0\u1eddng ch\u00e9o c\u1ee7a n\u00f3 l\u00e0 16 cm.<\/p>\n<p dir=\"ltr\">B\u00e0i h\u1ecdc 4: T\u00ednh di\u1ec7n t\u00edch c\u1ee7a h\u00ecnh thoi ABCD r\u1eb1ng chi\u1ec1u d\u00e0i b\u00ean l\u00e0 2cm v\u00e0 g\u00f3c l\u00e0 30 \u0111\u1ed9.<\/p>\n<p dir=\"ltr\">B\u00e0i 5: T\u00ednh di\u1ec7n t\u00edch h\u00ecnh thoi v\u1edbi c\u00e1c \u0111\u01b0\u1eddng ch\u00e9o 6cm v\u00e0 8cm. <\/p>\n<p dir=\"ltr\">B\u00e0i 6: M\u1ed9t tr\u01b0\u1eddng h\u00ecnh thoi c\u00f3 chi\u1ec1u d\u00e0i \u0111\u01b0\u1eddng ch\u00e9o nh\u1ecf l\u00e0 24m, chi\u1ec1u d\u00e0i ch\u00e9o l\u1edbn h\u01a1n 2 l\u1ea7n so v\u1edbi m\u1ed9t \u0111\u01b0\u1eddng ch\u00e9o nh\u1ecf. H\u1ecfi khu v\u1ef1c c\u1ee7a l\u0129nh v\u1ef1c bao nhi\u00eau?<\/p>\n<p dir=\"ltr\">B\u00e0i 7: M\u1ed9t h\u00ecnh thoi c\u00f3 chu vi 36cm. Chi\u1ec1u d\u00e0i c\u1ea1nh c\u1ee7a n\u00f3 l\u00e0 bao nhi\u00eau?<\/p>\n<p dir=\"ltr\">B\u00e0i 8: M\u1ed9t h\u00ecnh thoi c\u00f3 chi\u1ec1u d\u00e0i 2 \u0111\u01b0\u1eddng ch\u00e9o x 12cm v\u00e0 16cm. H\u1ecfi \u0111\u1ed9 d\u00e0i c\u1ea1nh c\u1ee7a h\u00ecnh thoi \u0111\u00f3?<\/p>\n<p dir=\"ltr\">B\u00e0i 9: T\u00ednh di\u1ec7n t\u00edch c\u1ee7a h\u00ecnh thoi bi\u1ebft chi\u1ec1u d\u00e0i c\u1ee7a hai \u0111\u01b0\u1eddng ch\u00e9o l\u00e0 16cm v\u00e0 20 cm t\u01b0\u01a1ng \u1ee9ng.<\/p>\n<p dir=\"ltr\">B\u00e0i 10: M\u1ed9t h\u00ecnh thoi c\u00f3 chi\u1ec1u d\u00e0i \u0111\u01b0\u1eddng ch\u00e9o l\u1edbn l\u00e0 12dm, di\u1ec7n t\u00edch h\u00ecnh thoi l\u00e0 48dm2. T\u00ednh chi\u1ec1u d\u00e0i \u0111\u01b0\u1eddng ch\u00e9o c\u00f2n l\u1ea1i c\u1ee7a h\u00ecnh thoi.<\/p>\n<p dir=\"ltr\">B\u00e0i 11: Diamond ABCD c\u00f3 chi\u1ec1u d\u00e0i ch\u00e9o AC = 15cm, chi\u1ec1u d\u00e0i ch\u00e9o BD b\u1eb1ng 2\/3 chi\u1ec1u d\u00e0i c\u1ee7a \u0111\u01b0\u1eddng ch\u00e9o AC. T\u00ednh di\u1ec7n t\u00edch h\u00ecnh thoi ABCD.<\/p>\n<p dir=\"ltr\">B\u00e0i h\u1ecdc 12: T\u00ednh di\u1ec7n t\u00edch c\u1ee7a h\u00ecnh thoi MNPQ bi\u1ebft c\u1ea1nh AB = 22cm v\u00e0 c\u1ea1nh AD = 17cm.<\/p>\n<p dir=\"ltr\">B\u00e0i h\u1ecdc 13: \u0110\u1ed1i v\u1edbi m\u1ed9t h\u00ecnh thoi c\u00f3 di\u1ec7n t\u00edch b\u1eb1ng di\u1ec7n t\u00edch vu\u00f4ng l\u00e0 10cm, bi\u1ebft m\u1ed9t \u0111\u01b0\u1eddng ch\u00e9o ch\u00e9o b\u1eb1ng chi\u1ec1u d\u00e0i c\u1ee7a c\u1ea1nh vu\u00f4ng. T\u00ednh chi\u1ec1u d\u00e0i \u0111\u01b0\u1eddng ch\u00e9o c\u00f2n l\u1ea1i c\u1ee7a h\u00ecnh thoi.<\/p>\n<p dir=\"ltr\">B\u00e0i 14: T\u1ef7 l\u1ec7 gi\u1eefa hai \u0111\u01b0\u1eddng ch\u00e9o l\u00e0 4\/9. S\u1ef1 kh\u00e1c bi\u1ec7t c\u1ee7a hai \u0111\u01b0\u1eddng ch\u00e9o l\u00e0 20m. T\u00ednh di\u1ec7n t\u00edch c\u1ee7a kim c\u01b0\u01a1ng?<\/p>\n<p dir=\"ltr\">B\u00e0i 15: M\u1ed9t h\u00ecnh thoi v\u1edbi t\u1ed5ng chi\u1ec1u d\u00e0i c\u1ee7a hai \u0111\u01b0\u1eddng ch\u00e9o l\u00e0 270cm, bi\u1ebft \u0111\u1ed9 d\u00e0i \u0111\u01b0\u1eddng ch\u00e9o ng\u1eafn l\u00e0 4\/5 chi\u1ec1u d\u00e0i c\u1ee7a chi\u1ec1u d\u00e0i \u0111\u01b0\u1eddng ch\u00e9o. T\u00ednh di\u1ec7n t\u00edch h\u00ecnh thoi.<\/p>\n<p dir=\"ltr\">B\u00e0i 16: M\u1ed9t v\u00f9ng \u0111\u1ea5t kim c\u01b0\u01a1ng c\u00f3 chi\u1ec1u d\u00e0i \u0111\u01b0\u1eddng ch\u00e9o \u0111\u1ea7u ti\u00ean l\u00e0 72m, \u0111\u01b0\u1eddng ch\u00e9o th\u1ee9 hai c\u00f3 chi\u1ec1u d\u00e0i 2\/3 chi\u1ec1u d\u00e0i \u0111\u01b0\u1eddng ch\u00e9o \u0111\u1ea7u ti\u00ean. M\u1ecdi ng\u01b0\u1eddi tr\u1ed3ng s\u1eafn tr\u00ean \u0111\u1ea5t, m\u1ed7i m\u00e9t vu\u00f4ng thu ho\u1ea1ch 5kg s\u1eafn. Ng\u01b0\u1eddi d\u00e2n thu ho\u1ea1ch bao nhi\u00eau km trong \u0111\u1ea5t?<\/p>\n<h2 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Meo_de_giup_con_ban_lam_mot_khu_vuc_hinh_thoi_hieu_qua\"><\/span>M\u1eb9o \u0111\u1ec3 gi\u00fap con b\u1ea1n l\u00e0m m\u1ed9t khu v\u1ef1c h\u00ecnh thoi hi\u1ec7u qu\u1ea3<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p dir=\"ltr\">\u0110\u1ec3 gi\u00fap tr\u1ebb h\u1ecdc, ti\u1ebfp thu v\u00e0 th\u1ef1c h\u00e0nh chinh ph\u1ee5c h\u00ecnh th\u1ee9c t\u00ednh to\u00e1n di\u1ec7n t\u00edch c\u1ee7a h\u00ecnh thoi, \u0111\u00e2y l\u00e0 m\u1ed9t s\u1ed1 l\u1eddi khuy\u00ean h\u1eefu \u00edch:<\/p>\n<h3 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Tao_niem_dam_me_va_phan_khich_cho_tre_em_voi_toan_hoc_khi\"><\/span>T\u1ea1o ni\u1ec1m \u0111am m\u00ea v\u00e0 ph\u1ea5n kh\u00edch cho tr\u1ebb em v\u1edbi to\u00e1n h\u1ecdc kh\u1ec9<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p dir=\"ltr\">To\u00e1n h\u1ecdc l\u00e0 m\u1ed9t m\u00f4n h\u1ecdc kh\u00e1 kh\u00f4 khan, v\u1edbi s\u1ed1 l\u01b0\u1ee3ng, t\u00ednh to\u00e1n, h\u00ecnh h\u1ecdc &#8230; do \u0111\u00f3, n\u1ebfu b\u1ea1n kh\u00f4ng mang l\u1ea1i cho con b\u1ea1n \u0111am m\u00ea v\u00e0 s\u1ef1 quan t\u00e2m, b\u1ea1n ch\u1eafc ch\u1eafn s\u1ebd r\u1ea5t nhanh khi b\u1ea1n h\u1ecdc, c\u0169ng nh\u01b0 gi\u1ea3m thi\u1ec3u kh\u1ea3 n\u0103ng h\u1ea5p th\u1ee5.<\/p>\n<p dir=\"ltr\">V\u00ec v\u1eady, ngo\u00e0i c\u00e1c b\u00e0i h\u1ecdc to\u00e1n h\u1ecdc, ph\u1ee5 huynh c\u00f3 th\u1ec3 \u0111\u1ec3 con c\u00e1i h\u1ecd h\u1ecdc, vui ch\u01a1i v\u00e0 th\u1ef1c h\u00e0nh v\u1edbi to\u00e1n h\u1ecdc th\u00f4ng qua to\u00e1n kh\u1ec9. \u0110\u00e2y l\u00e0 m\u1ed9t trong nh\u1eefng \u1ee9ng d\u1ee5ng to\u00e1n h\u1ecdc song ng\u1eef \u0111\u01b0\u1ee3c ph\u00e1t tri\u1ec3n b\u1edfi kh\u1ec9 cho tr\u1ebb m\u1eabu gi\u00e1o v\u00e0 tr\u1ebb em ti\u1ec3u h\u1ecdc. V\u1edbi n\u1ed9i dung g\u1ea7n \u0111\u00fang v\u1edbi ch\u01b0\u01a1ng tr\u00ecnh gi\u00e1o d\u1ee5c m\u1edbi nh\u1ea5t c\u1ee7a B\u1ed9, nh\u1eb1m m\u1ee5c \u0111\u00edch ph\u00e1t tri\u1ec3n n\u0103ng l\u1ef1c to\u00e0n di\u1ec7n c\u1ee7a tr\u1ebb em thay v\u00ec truy\u1ec1n \u0111\u1ea1t ki\u1ebfn \u200b\u200bth\u1ee9c. V\u00ec v\u1eady, khi h\u1ecdc v\u1edbi Shining Home &#8211; Gia \u0111\u00ecnh Anh Ng\u1eef Math, n\u00f3 s\u1ebd gi\u00fap x\u00e2y d\u1ef1ng n\u1ec1n t\u1ea3ng c\u1ee7a em b\u00e9 v\u00e0 t\u00ecnh y\u00eau 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\/cong-thuc-tinh-dien-tich-hinh-thoi-3.jpg\" alt=\"X\u00e2y d\u1ef1ng m\u1ed9t n\u1ec1n t\u1ea3ng to\u00e1n h\u1ecdc cho tr\u1ebb em t\u1eeb nh\u1ecf v\u1edbi to\u00e1n h\u1ecdc kh\u1ec9. (\u1ea2nh: Kh\u1ec9)\" width=\"100%\"><\/p>\n<p dir=\"ltr\">C\u1ee5 th\u1ec3, n\u1ed9i dung b\u00e0i h\u1ecdc tr\u00ean \u1ee9ng d\u1ee5ng \u0111\u01b0\u1ee3c theo s\u00e1t b\u1edfi h\u01a1n 60 ch\u1ee7 \u0111\u1ec1 to\u00e1n h\u1ecdc, t\u1eeb h\u00ecnh h\u1ecdc \u0111\u1ebfn h\u00ecnh h\u1ecdc. T\u1ea5t c\u1ea3 \u0111\u1ec1u \u0111\u01b0\u1ee3c d\u1ea1y d\u01b0\u1edbi d\u1ea1ng video, ho\u1ea1t h\u00ecnh h\u00e0i h\u01b0\u1edbc, v\u00ec v\u1eady n\u00f3 s\u1ebd gi\u00fap t\u0103ng kh\u1ea3 n\u0103ng h\u1ea5p th\u1ee5 t\u1ed1t h\u01a1n c\u1ee7a con b\u1ea1n. C\u00f9ng v\u1edbi h\u01a1n 10.000 ho\u1ea1t \u0111\u1ed9ng t\u01b0\u01a1ng t\u00e1c, \u0111\u1ec3 gi\u00fap tr\u1ebb ch\u01a1i v\u00e0 h\u1ecdc c\u00e1ch gi\u00fap ph\u00e1t tri\u1ec3n kh\u1ea3 n\u0103ng quan s\u00e1t, nh\u1edb, t\u00ednh to\u00e1n v\u00e0 suy ngh\u0129 m\u1ed9t c\u00e1ch \u0111\u00e1ng ch\u00fa \u00fd.<\/p>\n<p dir=\"ltr\">Ch\u1ec9 v\u1edbi 2000 VND\/ng\u00e0y, nh\u01b0ng hi\u1ec7u \u1ee9ng m\u00e0 Shining Home &#8211; Gia \u0111\u00ecnh Anh Ng\u1eef Math mang \u0111\u1ebfn s\u1ef1 ph\u00e1t tri\u1ec3n c\u1ee7a tr\u00ed tu\u1ec7, suy ngh\u0129 v\u00e0 ng\u00f4n ng\u1eef c\u1ee7a em b\u00e9 v\u01b0\u1ee3t tr\u1ed9i. N\u1ebfu b\u1ea1n c\u0169ng \u0111ang c\u1ed1 g\u1eafng gi\u00fap b\u00e9 \u0111\u1ea1t \u0111\u01b0\u1ee3c th\u00e0nh t\u00edch n\u00e0y, h\u00e3y th\u1eed con b\u1ea1n tr\u1ea3i nghi\u1ec7m \u1ee9ng d\u1ee5ng ngay h\u00f4m nay.<\/p>\n<p dir=\"ltr\"><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=\"185\" height=\"38\"><\/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=\"Lam_chu_kien_%E2%80%8B%E2%80%8Bthuc_co_ban_ve_hinh_hoc_va_hinh_thoi\"><\/span>L\u00e0m ch\u1ee7 ki\u1ebfn \u200b\u200bth\u1ee9c c\u01a1 b\u1ea3n v\u1ec1 h\u00ecnh h\u1ecdc v\u00e0 h\u00ecnh thoi<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p dir=\"ltr\">H\u00ecnh thoi l\u00e0 m\u1ed9t trong nh\u1eefng lo\u1ea1i h\u00ecnh h\u1ecdc t\u1eadp ph\u1ed5 bi\u1ebfn, v\u00ec v\u1eady s\u1ebd c\u00f3 c\u00e1c \u0111\u1eb7c \u0111i\u1ec3m li\u00ean quan gi\u1eefa ch\u00fang. Do \u0111\u00f3, ngo\u00e0i vi\u1ec7c h\u1ecdc v\u00e0 l\u00e0m ch\u1ee7 ki\u1ebfn \u200b\u200bth\u1ee9c v\u1ec1 h\u00ecnh thoi, c\u00f4ng th\u1ee9c t\u00ednh to\u00e1n khu v\u1ef1c, ph\u1ee5 huynh c\u0169ng c\u1ea7n xem x\u00e9t v\u1edbi c\u00e1c b\u00e0i h\u1ecdc li\u00ean quan \u0111\u1ebfn tr\u1ebb em nh\u01b0 b\u1ea3n ch\u1ea5t c\u1ee7a t\u1ee9 gi\u00e1c, \u0111\u01b0\u1eddng ch\u00e9o, &#8230; n\u1eafm b\u1eaft nhi\u1ec1u ki\u1ebfn \u200b\u200bth\u1ee9c h\u01a1n, s\u1ebd gi\u00fap tr\u1ebb h\u1ecdc b\u00e0i h\u1ecdc v\u00e0 chinh ph\u1ee5c c\u00e1c b\u00e0i t\u1eadp nh\u1eb9 nh\u00e0ng h\u01a1n.<\/p>\n<p dir=\"ltr\">\u0110\u1ed3ng th\u1eddi, cha m\u1eb9 n\u00ean th\u01b0\u1eddng xuy\u00ean ki\u1ec3m tra ki\u1ebfn \u200b\u200bth\u1ee9c c\u0169 c\u1ee7a h\u1ecd, \u0111\u1ec3 tr\u00e1nh tr\u01b0\u1eddng h\u1ee3p c\u1ee7a con c\u00e1i tr\u01b0\u1edbc khi qu\u00ean sau \u0111\u00f3. N\u1ebfu v\u1eady, b\u1ea1n n\u00ean c\u1ee7ng c\u1ed1 v\u00e0 h\u01b0\u1edbng d\u1eabn k\u1ecbp th\u1eddi \u0111\u1ec3 em b\u00e9 n\u1eafm b\u1eaft v\u00e0 tr\u00e1nh t\u1ea1o ra nh\u1eefng kho\u1ea3ng tr\u1ed1ng ki\u1ebfn \u200b\u200bth\u1ee9c.<\/p>\n<h3 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Nghien_cuu_song_song_voi_hanh_tay\"><\/span>Nghi\u00ean c\u1ee9u song song v\u1edbi h\u00e0nh t\u00e2y<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p dir=\"ltr\">Sau khi \u0111\u1ea1t \u0111\u01b0\u1ee3c l\u00fd thuy\u1ebft, cha m\u1eb9 n\u00ean t\u1ea1o \u0111i\u1ec1u ki\u1ec7n, khuy\u1ebfn kh\u00edch tr\u1ebb th\u1ef1c h\u00e0nh v\u00e0 th\u1ef1c h\u00e0nh th\u01b0\u1eddng xuy\u00ean h\u01a1n. V\u00ed d\u1ee5, t\u00f4i bi\u1ebft c\u00f4ng th\u1ee9c t\u00ednh to\u00e1n khu v\u1ef1c h\u00ecnh thoi, ti\u1ebfp theo l\u00e0 t\u00f4i \u0111\u1ec3 gi\u1ea3i quy\u1ebft c\u00e1c b\u00e0i t\u1eadp li\u00ean quan, t\u00ecm hi\u1ec3u th\u00eam tr\u00ean internet c\u00f3 nh\u1eefng b\u00e0i h\u1ecdc m\u1edbi, t\u00ecm hi\u1ec3u ki\u1ebfn \u200b\u200bth\u1ee9c n\u00e2ng cao h\u01a1n &#8230; \u0110i\u1ec1u n\u00e0y s\u1ebd gi\u00fap tr\u1ebb ph\u00e1t tri\u1ec3n kh\u1ea3 n\u0103ng to\u00e1n h\u1ecdc t\u1ed1t h\u01a1n m\u1ed7i ng\u00e0y.<\/p>\n<h3 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Hoc_toan_hoc_hinh_thoi_thong_qua_thuc_hanh\"><\/span>H\u1ecdc to\u00e1n h\u1ecdc h\u00ecnh thoi th\u00f4ng qua th\u1ef1c h\u00e0nh<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p dir=\"ltr\">V\u1edbi m\u1ed9t h\u00ecnh thoi, trong th\u1ef1c t\u1ebf c\u00f3 nhi\u1ec1u h\u00ecnh \u1ea3nh c\u1ee7a h\u00ecnh h\u1ecdc n\u00e0y nh\u01b0 gi\u00e1 s\u00e1ch, t\u1ee7, di\u1ec1u, &#8230; cha m\u1eb9 c\u00f3 th\u1ec3 l\u1ea5y v\u00ed d\u1ee5 v\u1ec1 k\u00edch th\u01b0\u1edbc c\u1ee7a c\u00e1c c\u1ea1nh c\u1ee7a nh\u1eefng h\u00ecnh \u1ea3nh n\u00e0y, v\u00e0 sau \u0111\u00f3 cho ch\u00fang t\u00ecm khu v\u1ef1c. H\u1ecdc th\u00f4ng qua c\u00e1c v\u00ed d\u1ee5 th\u1ef1c t\u1ebf s\u1ebd gi\u00fap tr\u1ebb em d\u1ec5 d\u00e0ng h\u00ecnh dung h\u01a1n, c\u0169ng nh\u01b0 t\u0103ng kh\u1ea3 n\u0103ng quan s\u00e1t, nh\u1edb, ti\u1ebfp thu v\u00e0 h\u1ecdc to\u00e1n 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\/cong-thuc-tinh-dien-tich-hinh-thoi-4.jpg\" alt=\"N\u00f3 l\u00e0 \u0111i\u1ec1u c\u1ea7n thi\u1ebft v\u1edbi con b\u1ea1n \u0111\u1ec3 h\u1ecdc, th\u1ef1c h\u00e0nh v\u00e0 \u00e1p d\u1ee5ng trong th\u1ef1c t\u1ebf. (\u1ea2nh: B\u1ed9 s\u01b0u t\u1eadp Internet)\" width=\"100%\"><\/p>\n<h2 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Mot_so_ghi_chu_khi_tinh_toan_dien_tich_hinh_thoi\"><\/span>M\u1ed9t s\u1ed1 ghi ch\u00fa khi t\u00ednh to\u00e1n di\u1ec7n t\u00edch 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 to\u00e1n t\u00ednh to\u00e1n di\u1ec7n t\u00edch c\u1ee7a kim c\u01b0\u01a1ng, \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, khu v\u1ef1c 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: #c2e0f4\" border=\"1\">\n<tr>\n<td style=\"width: 98.5189%\">\n<p style=\"text-align: center\">Ch\u00ednh t\u1ea3 ti\u1ebfng Anh d\u1ec5 d\u00e0ng nh\u01b0 ng\u01b0\u1eddi Vi\u1ec7t Nam ch\u1ec9 v\u1edbi 10 ph\u00fat luy\u1ec7n t\u1eadp m\u1ed7i ng\u00e0y v\u1edbi h\u01a1n 200 cu\u1ed1n s\u00e1ch n\u00f3i r\u1eb1ng c\u00e1c ch\u1ee7 \u0111\u1ec1 \u0111a d\u1ea1ng. \u0110\u0103ng k\u00fd ngay \u0111\u1ec3 nh\u1eadn t\u00e0i li\u1ec7u mi\u1ec5n ph\u00ed.     <\/p>\n<p style=\"text-align: center\">\n<p 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\/button_dang-ky-ngay-1.png\" alt=\"\" width=\"185\" height=\"25\"><\/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 th\u00f4ng tin v\u1ec1 ki\u1ebfn \u200b\u200bth\u1ee9c c\u01a1 b\u1ea3n v\u1ec1 c\u00e1ch t\u00ednh di\u1ec7n t\u00edch h\u00ecnh thoi. \u0110\u00e2y l\u00e0 m\u1ed9t h\u00ecnh h\u1ecdc kh\u00e1 \u0111\u1eb7c bi\u1ec7t, nh\u01b0ng hi\u1ec3u c\u00e1c c\u00f4ng th\u1ee9c li\u00ean quan \u0111\u1ebfn h\u00ecnh \u1ea3nh l\u00e0 ti\u1ec1n \u0111\u1ec1 \u0111\u1ec3 con b\u1ea1n gi\u1ea3i quy\u1ebft b\u00e0i t\u1eadp ch\u00ednh x\u00e1c, c\u0169ng nh\u01b0 c\u00e1c \u1ee9ng d\u1ee5ng t\u1ed1t h\u01a1n. V\u00ec v\u1eady, cha m\u1eb9, h\u00e3y tham gia c\u00f9ng em b\u00e9 \u0111\u1ec3 gi\u1ea3i m\u1ed9t b\u00e0i t\u1eadp h\u00ecnh thoi hi\u1ec7u qu\u1ea3.<\/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>C\u00f4ng th\u1ee9c t\u00ednh to\u00e1n di\u1ec7n t\u00edch kim c\u01b0\u01a1ng \u0111\u01b0\u1ee3c t\u00ednh theo m\u1ed9t n\u1eeda chi\u1ec1u d\u00e0i ch\u00e9o, c\u00f9ng v\u1edbi vi\u1ec7c h\u1ecd c\u1ea7n hi\u1ec3u c\u00e1c lo\u1ea1i b\u00e0i t\u1eadp li\u00ean quan, gi\u1ea3i ph\u00e1p \u0111\u1ec3 chinh ph\u1ee5c c\u00e1c b\u00e0i t\u1eadp hi\u1ec7u qu\u1ea3. T\u1ea5t c\u1ea3 s\u1ebd \u0111\u01b0\u1ee3c chi ti\u1ebft b\u1edfi Shining Home &#8211; Gia \u0111\u00ecnh Anh Ng\u1eef trong b\u00e0i vi\u1ebft&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[100],"tags":[],"class_list":["post-15161","post","type-post","status-publish","format-standard","hentry","category-kien-thuc"],"_links":{"self":[{"href":"https:\/\/www.ckconitsha.com\/vn\/wp-json\/wp\/v2\/posts\/15161","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=15161"}],"version-history":[{"count":2,"href":"https:\/\/www.ckconitsha.com\/vn\/wp-json\/wp\/v2\/posts\/15161\/revisions"}],"predecessor-version":[{"id":22074,"href":"https:\/\/www.ckconitsha.com\/vn\/wp-json\/wp\/v2\/posts\/15161\/revisions\/22074"}],"wp:attachment":[{"href":"https:\/\/www.ckconitsha.com\/vn\/wp-json\/wp\/v2\/media?parent=15161"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ckconitsha.com\/vn\/wp-json\/wp\/v2\/categories?post=15161"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ckconitsha.com\/vn\/wp-json\/wp\/v2\/tags?post=15161"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}