{"id":14369,"date":"2025-06-08T04:29:46","date_gmt":"2025-06-07T21:29:46","guid":{"rendered":"https:\/\/www.ckconitsha.com\/vn\/?p=14369"},"modified":"2025-07-04T18:00:05","modified_gmt":"2025-07-04T11:00:05","slug":"ly-thuyet-va-bai-tap-hinh-binh-hanh-lop-4-tu-co-ban-den-nang-cao","status":"publish","type":"post","link":"https:\/\/www.ckconitsha.com\/vn\/ly-thuyet-va-bai-tap-hinh-binh-hanh-lop-4-tu-co-ban-den-nang-cao\/","title":{"rendered":"L\u00fd thuy\u1ebft v\u00e0 b\u00e0i t\u1eadp h\u00ecnh b\u00ecnh h\u00e0nh l\u1edbp 4 (t\u1eeb c\u01a1 b\u1ea3n \u0111\u1ebfn n\u00e2ng cao)"},"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\/ly-thuyet-va-bai-tap-hinh-binh-hanh-lop-4-tu-co-ban-den-nang-cao\/#Dinh_nghia_hinh_binh_hanh_cua_lop_4\" >\u0110\u1ecbnh ngh\u0129a h\u00ecnh b\u00ecnh h\u00e0nh c\u1ee7a l\u1edbp 4<\/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\/ly-thuyet-va-bai-tap-hinh-binh-hanh-lop-4-tu-co-ban-den-nang-cao\/#Tinh_chat_cua_hinh_binh_hanh\" >T\u00ednh ch\u1ea5t c\u1ee7a h\u00ecnh b\u00ecnh h\u00e0nh<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.ckconitsha.com\/vn\/ly-thuyet-va-bai-tap-hinh-binh-hanh-lop-4-tu-co-ban-den-nang-cao\/#Dau_hieu_nhan_dang_hinh_binh_hanh\" >D\u1ea5u hi\u1ec7u nh\u1eadn d\u1ea1ng h\u00ecnh b\u00ecnh h\u00e0nh<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.ckconitsha.com\/vn\/ly-thuyet-va-bai-tap-hinh-binh-hanh-lop-4-tu-co-ban-den-nang-cao\/#Cong_thuc_tinh_toan_tap_the_Hinh_binh_hanh_cua_lop_4\" >C\u00f4ng th\u1ee9c t\u00ednh to\u00e1n t\u1eadp th\u1ec3, H\u00ecnh b\u00ecnh h\u00e0nh c\u1ee7a l\u1edbp 4<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.ckconitsha.com\/vn\/ly-thuyet-va-bai-tap-hinh-binh-hanh-lop-4-tu-co-ban-den-nang-cao\/#Cong_thuc_tinh_toan_chu_vi_cua_lop_4\" >C\u00f4ng th\u1ee9c t\u00ednh to\u00e1n chu vi c\u1ee7a l\u1edbp 4<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.ckconitsha.com\/vn\/ly-thuyet-va-bai-tap-hinh-binh-hanh-lop-4-tu-co-ban-den-nang-cao\/#Cong_thuc_tinh_toan_hinh_binh_hanh_cua_lop_4\" >C\u00f4ng th\u1ee9c t\u00ednh to\u00e1n h\u00ecnh b\u00ecnh h\u00e0nh c\u1ee7a l\u1edbp 4<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/www.ckconitsha.com\/vn\/ly-thuyet-va-bai-tap-hinh-binh-hanh-lop-4-tu-co-ban-den-nang-cao\/#Giai_quyet_hinh_binh_hanh_cua_lop_4_trang_102_103_sach_giao_khoa\" >Gi\u1ea3i quy\u1ebft h\u00ecnh b\u00ecnh h\u00e0nh c\u1ee7a l\u1edbp 4 trang 102, 103 s\u00e1ch gi\u00e1o khoa<\/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\/ly-thuyet-va-bai-tap-hinh-binh-hanh-lop-4-tu-co-ban-den-nang-cao\/#Bai_1_trang_102_%E2%80%93_103_Toan_lop_4_SGK\" >B\u00e0i 1, trang 102 &#8211; 103, To\u00e1n l\u1edbp 4 (SGK)<\/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\/ly-thuyet-va-bai-tap-hinh-binh-hanh-lop-4-tu-co-ban-den-nang-cao\/#Bai_2_trang_102_%E2%80%93_103_Toan_lop_4_SGK\" >B\u00e0i 2, trang 102 &#8211; 103, To\u00e1n l\u1edbp 4 (SGK)<\/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\/ly-thuyet-va-bai-tap-hinh-binh-hanh-lop-4-tu-co-ban-den-nang-cao\/#Bai_3_trang_102_%E2%80%93_103_Toan_lop_4_SGK\" >B\u00e0i 3, trang 102 &#8211; 103, To\u00e1n l\u1edbp 4 (SGK)<\/a><\/li><\/ul><\/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\/ly-thuyet-va-bai-tap-hinh-binh-hanh-lop-4-tu-co-ban-den-nang-cao\/#Mot_so_bai_tap_toan_lop_4_la_pho_bien_co_cau_tra_loi\" >M\u1ed9t s\u1ed1 b\u00e0i t\u1eadp to\u00e1n l\u1edbp 4 l\u00e0 ph\u1ed5 bi\u1ebfn (c\u00f3 c\u00e2u tr\u1ea3 l\u1eddi)<\/a><\/li><\/ul><\/nav><\/div>\n<\/p>\n<p>H\u00ecnh b\u00ecnh h\u00e0nh l\u00e0 m\u1ed9t kh\u1ed1i h\u00ecnh h\u1ecdc ph\u1ed5 bi\u1ebfn m\u00e0 ch\u00fang ta th\u01b0\u1eddng g\u1eb7p trong cu\u1ed9c s\u1ed1ng h\u00e0ng ng\u00e0y. Khi l\u1edbp 4, tr\u1ebb s\u1ebd b\u1eaft \u0111\u1ea7u h\u1ecdc ki\u1ebfn \u200b\u200bth\u1ee9c v\u1ec1 h\u00ecnh b\u00ecnh h\u00e0nh. Trong b\u00e0i vi\u1ebft n\u00e0y, Shining Home &#8211; Gia \u0111\u00ecnh Anh Ng\u1eef s\u1ebd cung c\u1ea5p cho b\u1ea1n m\u1ed9t c\u00e1i nh\u00ecn t\u1ed5ng quan v\u1ec1 n\u1ed9i dung c\u1ee7a l\u1edbp th\u1ee9 4 theo c\u00e1ch chi ti\u1ebft nh\u1ea5t. H\u00e3y theo d\u00f5i!<\/p>\n<p>                        Xem t\u1ea5t c\u1ea3<\/p>\n<h2 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Dinh_nghia_hinh_binh_hanh_cua_lop_4\"><\/span>\u0110\u1ecbnh ngh\u0129a h\u00ecnh b\u00ecnh h\u00e0nh c\u1ee7a l\u1edbp 4<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p dir=\"ltr\">Song song l\u1edbp th\u1ee9 4 \u0111\u01b0\u1ee3c hi\u1ec3u \u0111\u01a1n gi\u1ea3n l\u00e0 m\u1ed9t h\u00ecnh t\u1ee9 gi\u00e1c v\u1edbi c\u00e1c c\u1ea1nh song song v\u00e0 song song.<\/p>\n<p dir=\"ltr\">V\u00ed d\u1ee5:<\/p>\n<p dir=\"ltr\"><img decoding=\"async\" class=\"lazyload\" src=\"https:\/\/external-content.duckduckgo.com\/iu\/?u=https:\/\/vnmedia2.monkeyuni.net\/upload\/web\/img\/1-hinh-binh-hanh-lop-4.png\" alt=\"H\u00ecnh \u1ea3nh c\u1ee7a l\u1edbp 4. (\u1ea2nh: B\u1ed9 s\u01b0u t\u1eadp Internet)\" width=\"100%\"><\/p>\n<p dir=\"ltr\">Ch\u00fang t\u00f4i c\u00f3 m\u1ed9t h\u00ecnh b\u00ecnh h\u00e0nh ABCD, trong \u0111\u00f3:<\/p>\n<ul>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">C\u00e1c c\u1ea1nh AB song song v\u1edbi c\u1ea1nh DC.<\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">C\u00e1c c\u1ea1nh c\u1ee7a AD l\u00e0 song song v\u1edbi c\u1ea1nh c\u1ee7a BC.<\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">AB = DC v\u00e0 AD = BC. <\/p>\n<\/li>\n<\/ul>\n<h2 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Tinh_chat_cua_hinh_binh_hanh\"><\/span>T\u00ednh ch\u1ea5t c\u1ee7a h\u00ecnh b\u00ecnh h\u00e0nh<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p dir=\"ltr\">H\u00ecnh b\u00ecnh h\u00e0nh l\u1edbp 4 c\u00f3 c\u00e1c thu\u1ed9c t\u00ednh c\u01a1 b\u1ea3n sau:<\/p>\n<ul>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">C\u00e1c c\u1ea1nh \u0111\u1ed1i di\u1ec7n c\u1ee7a h\u00ecnh b\u00ecnh h\u00e0nh l\u00e0 c\u00e1c \u0111\u01b0\u1eddng th\u1eb3ng song song v\u00e0 c\u00f3 \u0111\u1ed9 d\u00e0i b\u1eb1ng nhau.<\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">Trong m\u1ed9t h\u00ecnh b\u00ecnh h\u00e0nh c\u1ee7a c\u00e1c g\u00f3c \u0111\u1ed1i di\u1ec7n s\u1ebd b\u1eb1ng nhau.<\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">Hai \u0111\u01b0\u1eddng ch\u00e9o c\u1ee7a m\u1ed9t h\u00ecnh b\u00ecnh h\u00e0nh giao nhau \u1edf \u0111i\u1ec3m gi\u1eefa c\u1ee7a m\u1ed7i d\u00f2ng.<\/p>\n<\/li>\n<\/ul>\n<h2 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Dau_hieu_nhan_dang_hinh_binh_hanh\"><\/span>D\u1ea5u hi\u1ec7u nh\u1eadn d\u1ea1ng h\u00ecnh b\u00ecnh h\u00e0nh<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p dir=\"ltr\">Trong ch\u01b0\u01a1ng tr\u00ecnh l\u1edbp 4, s\u1ebd c\u00f3 c\u00e1c y\u1ebfu t\u1ed1 sau \u0111\u00e2y \u0111\u1ec3 ch\u1ee9ng minh m\u1ed9t h\u00ecnh t\u1ee9 gi\u00e1c l\u00e0 h\u00ecnh b\u00ecnh h\u00e0nh:<\/p>\n<ul>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">C\u00e1c t\u1ee9 gi\u00e1c c\u00f3 c\u1eb7p \u0111\u1ed1i di\u1ec7n song song.<\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">C\u00e1c t\u1ee9 gi\u00e1c c\u00f3 c\u00e1c c\u1ea1nh \u0111\u1ed1i di\u1ec7n b\u1eb1ng nhau.<\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">T\u1ee9 gi\u00e1c c\u00f3 hai b\u00ean \u0111\u1ed1i di\u1ec7n song song v\u00e0 b\u1eb1ng nhau.<\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">T\u1ee9 gi\u00e1c c\u00f3 c\u00e1c g\u00f3c \u0111\u1ed1i di\u1ec7n b\u1eb1ng nhau (s\u1eed d\u1ee5ng th\u01b0\u1edbc \u0111o ho\u1eb7c d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c cung c\u1ea5p b\u1edfi v\u1ea5n \u0111\u1ec1).<\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">T\u1ee9 gi\u00e1c c\u00f3 hai \u0111\u01b0\u1eddng ch\u00e9o giao nhau \u1edf \u0111i\u1ec3m gi\u1eefa c\u1ee7a m\u1ed7i d\u00f2ng.<\/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\/2-hinh-binh-hanh-lop-4.png\" alt=\"D\u1ea5u hi\u1ec7u nh\u1eadn d\u1ea1ng h\u00ecnh b\u00ecnh h\u00e0nh. (\u1ea2nh: B\u1ed9 s\u01b0u t\u1eadp Internet)\" width=\"100%\"><\/p>\n<h2 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Cong_thuc_tinh_toan_tap_the_Hinh_binh_hanh_cua_lop_4\"><\/span>C\u00f4ng th\u1ee9c t\u00ednh to\u00e1n t\u1eadp th\u1ec3, H\u00ecnh b\u00ecnh h\u00e0nh c\u1ee7a l\u1edbp 4<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p dir=\"ltr\">\u0110\u1ec3 gi\u1ea3i quy\u1ebft c\u00e1c b\u00e0i t\u1eadp tr\u00ean h\u00ecnh b\u00ecnh h\u00e0nh l\u1edbp 4, b\u1ea1n c\u1ea7n bi\u1ebft hai c\u00f4ng th\u1ee9c c\u01a1 b\u1ea3n r\u1eb1ng b\u00e0i to\u00e1n h\u1ecdc l\u1edbp 4 l\u00e0 m\u1ed9t h\u00ecnh b\u00ecnh h\u00e0nh, bao g\u1ed3m: chu vi h\u00ecnh b\u00ecnh h\u00e0nh v\u00e0 di\u1ec7n t\u00edch h\u00ecnh b\u00ecnh h\u00e0nh.<\/p>\n<h3 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Cong_thuc_tinh_toan_chu_vi_cua_lop_4\"><\/span>C\u00f4ng th\u1ee9c t\u00ednh to\u00e1n chu vi c\u1ee7a l\u1edbp 4<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p dir=\"ltr\">C\u00f4ng th\u1ee9c chu vi c\u1ee7a h\u00ecnh b\u00ecnh h\u00e0nh \u0111\u01b0\u1ee3c t\u00ednh to\u00e1n b\u1eb1ng c\u00e1ch th\u00eam t\u1ed5ng chi\u1ec1u d\u00e0i c\u1ee7a t\u1ea5t c\u1ea3 c\u00e1c c\u1ea1nh c\u1ee7a h\u00ecnh \u1ea3nh \u0111\u00f3. V\u1edbi h\u00ecnh b\u00ecnh h\u00e0nh, ch\u00fang ta bi\u1ebft r\u1eb1ng c\u00e1c c\u1ea1nh \u0111\u1ed1i di\u1ec7n l\u00e0 song song v\u00e0 b\u1eb1ng nhau. Do \u0111\u00f3, \u0111\u1ec3 t\u00ednh to\u00e1n chu vi c\u1ee7a h\u00ecnh b\u00ecnh h\u00e0nh, ch\u00fang t\u00f4i s\u1ebd \u00e1p d\u1ee5ng c\u00f4ng th\u1ee9c sau:<\/p>\n<p dir=\"ltr\" style=\"text-align: center\">C = (a + b) x 2<\/p>\n<p dir=\"ltr\">Trong \u0111\u00f3:<\/p>\n<ul>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">C: chu vi c\u1ee7a h\u00ecnh b\u00ecnh h\u00e0nh<\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">A, B: Hai m\u1eb7t (kh\u00f4ng \u0111\u1ed1i di\u1ec7n) c\u1ee7a h\u00ecnh b\u00ecnh h\u00e0nh<\/p>\n<\/li>\n<\/ul>\n<p dir=\"ltr\">V\u00ed d\u1ee5: <\/p>\n<p dir=\"ltr\">N\u1ebfu ch\u00fang ta c\u00f3 h\u00ecnh b\u00ecnh h\u00e0nh v\u1edbi hai c\u1ea1nh \u0111\u01b0\u1ee3c \u0111o l\u1ea7n l\u01b0\u1ee3t l\u00e0 5 cm v\u00e0 8 cm, ch\u00fang ta c\u00f3 th\u1ec3 t\u00ednh chu vi nh\u01b0 sau:<\/p>\n<p dir=\"ltr\" style=\"text-align: center\">C = (5 + 8) x 2 = 26 cm<\/p>\n<p dir=\"ltr\">Do \u0111\u00f3, chu vi c\u1ee7a h\u00ecnh b\u00ecnh h\u00e0nh \u0111\u00f3 l\u00e0 26 cm.<\/p>\n<table style=\"border-collapse: collapse;width: 100.01%;background-color: #fbeeb8\" border=\"1\">\n<tr>\n<td style=\"width: 98.5932%\">\n<p style=\"text-align: center\">\u0110\u1eebng b\u1ecf l\u1ee1 !!<\/p>\n<p style=\"text-align: center\">Ch\u01b0\u01a1ng tr\u00ecnh to\u00e1n h\u1ecdc b\u1eb1ng ti\u1ebfng Anh, gi\u00fap ph\u00e1t tri\u1ec3n t\u01b0 duy theo c\u00e1ch to\u00e0n di\u1ec7n nh\u1ea5t.<\/p>\n<p style=\"text-align: center\">Nh\u1eadn t\u1ed1i \u0111a 40% \u01b0u \u0111\u00e3i ngay t\u1ea1i \u0111\u00e2y!<img decoding=\"async\" style=\"margin-left: auto;margin-right: auto\" class=\"lazyload\" src=\"https:\/\/external-content.duckduckgo.com\/iu\/?u=https:\/\/vnmedia2.monkeyuni.net\/upload\/web\/img\/taimienphiMM.png\" width=\"185\"><\/p>\n<\/td>\n<\/tr>\n<\/table>\n<h3 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Cong_thuc_tinh_toan_hinh_binh_hanh_cua_lop_4\"><\/span>C\u00f4ng th\u1ee9c t\u00ednh to\u00e1n h\u00ecnh b\u00ecnh h\u00e0nh c\u1ee7a l\u1edbp 4<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p dir=\"ltr\">V\u1ec1 b\u1ea3n ch\u1ea5t, h\u00ecnh b\u00ecnh h\u00e0nh l\u00e0 k\u00edch th\u01b0\u1edbc \u0111\u1ea7y \u0111\u1ee7 c\u1ee7a m\u1eb7t ph\u1eb3ng m\u00e0 ch\u00fang ta c\u00f3 th\u1ec3 th\u1ea5y v\u1ec1 h\u00ecnh b\u00ecnh h\u00e0nh. Do \u0111\u00f3, \u0111\u1ec3 t\u00ednh to\u00e1n di\u1ec7n t\u00edch h\u00ecnh b\u00ecnh h\u00e0nh, ch\u00fang t\u00f4i s\u1ebd \u00e1p d\u1ee5ng c\u00f4ng th\u1ee9c sau:<\/p>\n<p dir=\"ltr\" style=\"text-align: center\">S = ah<\/p>\n<p dir=\"ltr\">Trong \u0111\u00f3:<\/p>\n<ul>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">S: Khu v\u1ef1c c\u1ee7a h\u00ecnh b\u00ecnh h\u00e0nh<\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">A: C\u1ea1nh d\u01b0\u1edbi c\u1ee7a h\u00ecnh b\u00ecnh h\u00e0nh (l\u00e0 b\u1ea5t k\u1ef3 c\u1ea1nh n\u00e0o \u0111\u01b0\u1ee3c ch\u1ecdn \u0111\u1ec3 t\u00ednh to\u00e1n v\u00f9ng h\u00ecnh \u1ea3nh)<\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">H: Chi\u1ec1u cao c\u1ee7a h\u00ecnh b\u00ecnh h\u00e0nh (l\u00e0 chi\u1ec1u d\u00e0i c\u1ee7a m\u1ed9t \u0111o\u1ea1n k\u1ebft n\u1ed1i t\u1eeb \u0111\u1ec9nh \u0111\u1ebfn d\u01b0\u1edbi c\u00f9ng c\u1ee7a h\u00ecnh \u1ea3nh)<\/p>\n<\/li>\n<\/ul>\n<p dir=\"ltr\">V\u00ed d\u1ee5: <\/p>\n<p dir=\"ltr\">N\u1ebfu chi\u1ec1u d\u00e0i c\u1ea1nh c\u1ee7a h\u00ecnh b\u00ecnh h\u00e0nh l\u00e0 5 cm v\u00e0 chi\u1ec1u cao t\u01b0\u01a1ng \u1ee9ng l\u00e0 3 cm, ch\u00fang ta c\u00f3:<\/p>\n<p dir=\"ltr\" style=\"text-align: center\">S = 5 cm x 3 cm = 15 cm2<\/p>\n<p dir=\"ltr\">Do \u0111\u00f3, di\u1ec7n t\u00edch c\u1ee7a h\u00ecnh b\u00ecnh h\u00e0nh \u0111\u00f3 l\u00e0 15 cm2.<\/p>\n<p dir=\"ltr\">\n<h2 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Giai_quyet_hinh_binh_hanh_cua_lop_4_trang_102_103_sach_giao_khoa\"><\/span>Gi\u1ea3i quy\u1ebft h\u00ecnh b\u00ecnh h\u00e0nh c\u1ee7a l\u1edbp 4 trang 102, 103 s\u00e1ch gi\u00e1o khoa<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p dir=\"ltr\">D\u01b0\u1edbi \u0111\u00e2y l\u00e0 m\u1ed9t h\u01b0\u1edbng d\u1eabn \u0111\u1ec3 gi\u1ea3i quy\u1ebft v\u00e0 tr\u1ea3 l\u1eddi c\u00e1c b\u00e0i t\u1eadp to\u00e1n l\u1edbp 4 v\u1edbi h\u00ecnh b\u00ecnh h\u00e0nh l\u00e0 102, 103.<\/p>\n<h3 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Bai_1_trang_102_%E2%80%93_103_Toan_lop_4_SGK\"><\/span>B\u00e0i 1, trang 102 &#8211; 103, To\u00e1n l\u1edbp 4 (SGK)<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p dir=\"ltr\">\u0110\u1ec1 t\u00e0i:<\/p>\n<p dir=\"ltr\">Trong c\u00e1c h\u00ecnh \u1ea3nh sau, \u0111\u00f3 l\u00e0 m\u1ed9t h\u00ecnh b\u00ecnh h\u00e0nh?<\/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\/3-hinh-binh-hanh-lop-4.png\" alt=\"\" width=\"400\" height=\"176\"><\/p>\n<p dir=\"ltr\">Tr\u1ea3 l\u1eddi:<\/p>\n<p dir=\"ltr\"><em>(Xem l\u1ea1i d\u1ea5u hi\u1ec7u c\u1ee7a h\u00ecnh b\u00ecnh h\u00e0nh \u1edf ph\u1ea7n tr\u00ean.) <\/em><\/p>\n<p dir=\"ltr\">Parewasmic: H\u00ecnh 1, H\u00ecnh 2, H\u00ecnh 5.<\/p>\n<p dir=\"ltr\">Kh\u00f4ng ph\u1ea3i l\u00e0 h\u00ecnh b\u00ecnh h\u00e0nh: H\u00ecnh 3, H\u00ecnh 4 <em>(V\u00ec c\u00f3 m\u1ed9t c\u1eb7p \u0111\u1ed1i di\u1ec7n kh\u00f4ng song song)<\/em>.<\/p>\n<h3 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Bai_2_trang_102_%E2%80%93_103_Toan_lop_4_SGK\"><\/span>B\u00e0i 2, trang 102 &#8211; 103, To\u00e1n l\u1edbp 4 (SGK)<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p dir=\"ltr\">\u0110\u1ec1 t\u00e0i:<\/p>\n<p dir=\"ltr\">Ch\u1ec9 ra trong ABCD t\u1ee9 gi\u00e1c:<\/p>\n<ul>\n<li dir=\"ltr\">AB v\u00e0 CD l\u00e0 hai ph\u00eda \u0111\u1ed1i di\u1ec7n.<\/li>\n<li dir=\"ltr\">AD v\u00e0 BC l\u00e0 hai ph\u00eda \u0111\u1ed1i di\u1ec7n.<\/li>\n<\/ul>\n<p dir=\"ltr\">ABCD t\u1ee9 gi\u00e1c v\u00e0 h\u00ecnh b\u00ecnh h\u00e0nh c\u1ee7a MNPQ, trong hai h\u00ecnh \u1ea3nh \u0111\u00f3 c\u00f3 c\u00e1c c\u1eb7p song song v\u00e0 b\u1eb1ng nhau \u0111\u1ed1i di\u1ec7n?<\/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\/4-hinh-binh-hanh-lop-4.png\" alt=\"\" width=\"400\" height=\"129\"><\/p>\n<p dir=\"ltr\">Tr\u1ea3 l\u1eddi:<\/p>\n<p dir=\"ltr\"><em>(Mu\u1ed1n bi\u1ebft h\u00ecnh \u1ea3nh n\u00e0o c\u00f3 c\u1eb7p \u0111\u1ed1i di\u1ec7n song song v\u00e0 b\u1eb1ng nhau, ch\u00fang t\u00f4i s\u1ebd s\u1eed d\u1ee5ng th\u01b0\u1edbc \u0111o th\u1eb3ng \u0111\u1ec3 \u0111o v\u00e0 ki\u1ec3m tra.)<\/em><\/p>\n<p dir=\"ltr\">Trong hai h\u00ecnh \u1ea3nh \u0111\u00e3 cho, h\u00ecnh b\u00ecnh h\u00e0nh c\u1ee7a MNPQ c\u00f3 c\u00e1c c\u1eb7p \u0111\u1ed1i di\u1ec7n song song v\u00e0 b\u1eb1ng nhau.<\/p>\n<h3 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Bai_3_trang_102_%E2%80%93_103_Toan_lop_4_SGK\"><\/span>B\u00e0i 3, trang 102 &#8211; 103, To\u00e1n l\u1edbp 4 (SGK)<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p dir=\"ltr\">Ch\u1ee7 \u0111\u1ec1: V\u1ebd th\u00eam hai d\u00f2ng th\u1eb3ng \u0111\u1ec3 c\u00f3 \u0111\u01b0\u1ee3c h\u00ecnh b\u00ecnh h\u00e0nh.<\/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\/5-hinh-binh-hanh-lop-4.png\" alt=\"\" width=\"400\" height=\"126\"><\/p>\n<p dir=\"ltr\">Tr\u1ea3 l\u1eddi:<\/p>\n<p dir=\"ltr\"><img loading=\"lazy\" decoding=\"async\" class=\"lazyload\" src=\"https:\/\/external-content.duckduckgo.com\/iu\/?u=https:\/\/vnmedia2.monkeyuni.net\/upload\/web\/img\/6-hinh-binh-hanh-lop-4.png\" alt=\"\" width=\"400\" height=\"126\"><\/p>\n<h2 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Mot_so_bai_tap_toan_lop_4_la_pho_bien_co_cau_tra_loi\"><\/span>M\u1ed9t s\u1ed1 b\u00e0i t\u1eadp to\u00e1n l\u1edbp 4 l\u00e0 ph\u1ed5 bi\u1ebfn (c\u00f3 c\u00e2u tr\u1ea3 l\u1eddi)<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p dir=\"ltr\">B\u00e0i t\u1eadp 1: H\u00ecnh b\u00ecnh h\u00e0nh ABCD c\u00f3 chu vi 20 cm. T\u00ednh chi\u1ec1u d\u00e0i c\u1ee7a m\u1ed7i b\u00ean n\u1ebfu c\u00e1c c\u1ea1nh c\u1ee7a n\u00f3 b\u1eb1ng nhau.<\/p>\n<p dir=\"ltr\">Tr\u1ea3 l\u1eddi:<\/p>\n<p dir=\"ltr\">Ch\u00fang ta c\u00f3 c\u00f4ng th\u1ee9c c = (a + b) x 2, theo v\u1ea5n \u0111\u1ec1 ch\u00fang ta bi\u1ebft a = b.<\/p>\n<p dir=\"ltr\" style=\"text-align: center\">C = (a + b) x 2 = (a + a) x 2 = 4a \u21d4 20 = 4a A = 20\/4 = 5<\/p>\n<p dir=\"ltr\">V\u00ec v\u1eady, chi\u1ec1u d\u00e0i c\u1ee7a m\u1ed7i c\u1ea1nh c\u1ee7a h\u00ecnh b\u00ecnh h\u00e0nh l\u00e0 5 cm.<\/p>\n<p dir=\"ltr\">B\u00e0i t\u1eadp 2: H\u00ecnh b\u00ecnh h\u00e0nh ABCD c\u00f3 c\u1ea1nh d\u00e0i 8 cm v\u00e0 chi\u1ec1u cao t\u01b0\u01a1ng \u1ee9ng l\u00e0 5 cm. T\u00ednh di\u1ec7n t\u00edch c\u1ee7a h\u00ecnh b\u00ecnh h\u00e0nh n\u00e0y.<\/p>\n<p dir=\"ltr\">Tr\u1ea3 l\u1eddi:<\/p>\n<p dir=\"ltr\" style=\"text-align: center\">S = ah = ab xh = 8 cm x 5 cm = 40 cm2<\/p>\n<p dir=\"ltr\">B\u00e0i t\u1eadp 3: \u0110\u01b0a ra m\u1ed9t h\u00ecnh b\u00ecnh h\u00e0nh v\u1edbi chi\u1ec1u d\u00e0i t\u01b0\u01a1ng \u1ee9ng hai c\u1ea1nh, t\u01b0\u01a1ng \u1ee9ng 6 cm v\u00e0 10 cm. T\u00ednh chu vi c\u1ee7a h\u00ecnh b\u00ecnh h\u00e0nh \u0111\u00f3.<\/p>\n<p dir=\"ltr\">Tr\u1ea3 l\u1eddi:<\/p>\n<p dir=\"ltr\" style=\"text-align: center\">C = (6 + 10) x 2 = 32 cm<\/p>\n<p dir=\"ltr\">B\u00e0i t\u1eadp 4: Cho m\u1ed9t h\u00ecnh b\u00ecnh h\u00e0nh v\u1edbi chu vi 24 cm v\u00e0 m\u1ed9t b\u00ean l\u00e0 6 cm. T\u00ecm chi\u1ec1u d\u00e0i c\u1ea1nh c\u00f2n l\u1ea1i.<\/p>\n<p dir=\"ltr\">Tr\u1ea3 l\u1eddi:<\/p>\n<p dir=\"ltr\" style=\"text-align: center\">24 cm = (6 + x) x 2<\/p>\n<p dir=\"ltr\" style=\"text-align: center\">12 cm = 6 + x<\/p>\n<p dir=\"ltr\" style=\"text-align: center\">x = 12 &#8211; 6 = 6 cm<\/p>\n<p dir=\"ltr\">B\u00e0i t\u1eadp 5: \u0110\u01b0a ra m\u1ed9t h\u00ecnh b\u00ecnh h\u00e0nh v\u1edbi chu vi 28 cm v\u00e0 m\u1ed9t b\u00ean l\u00e0 9 cm. T\u00ecm chi\u1ec1u d\u00e0i c\u1ea1nh c\u00f2n l\u1ea1i.<\/p>\n<p dir=\"ltr\">Tr\u1ea3 l\u1eddi:<\/p>\n<p dir=\"ltr\" style=\"text-align: center\">28 cm = (9 + x) x 2<\/p>\n<p dir=\"ltr\" style=\"text-align: center\">14 cm = 9 + x<\/p>\n<p dir=\"ltr\" style=\"text-align: center\">x = 14 &#8211; 9 = 5 cm<\/p>\n<p dir=\"ltr\">B\u00e0i t\u1eadp 6: \u0110\u01b0a ra m\u1ed9t h\u00ecnh b\u00ecnh h\u00e0nh v\u1edbi chi\u1ec1u d\u00e0i t\u01b0\u01a1ng \u1ee9ng l\u00e0 hai c\u1ea1nh, 7 cm v\u00e0 9 cm. T\u00ednh di\u1ec7n t\u00edch c\u1ee7a h\u00ecnh b\u00ecnh h\u00e0nh \u0111\u00f3.<\/p>\n<p dir=\"ltr\">Tr\u1ea3 l\u1eddi:<\/p>\n<p dir=\"ltr\" style=\"text-align: center\">S = 7 cm x 9 cm = 63 cm2<\/p>\n<p dir=\"ltr\" style=\"text-align: left\">Xem th\u00eam:<\/p>\n<ol>\n<li dir=\"ltr\" style=\"text-align: left\">Shining Home &#8211; Gia \u0111\u00ecnh Anh Ng\u1eef Math &#8211; \u1ee8ng d\u1ee5ng to\u00e1n h\u1ecdc b\u1eb1ng ti\u1ebfng Anh s\u1ed1 1 cho tr\u1ebb m\u1eabu gi\u00e1o &amp; tr\u01b0\u1eddng ti\u1ec3u h\u1ecdc<\/li>\n<li dir=\"ltr\" style=\"text-align: left\">T\u00f4i n\u00ean l\u00e0m g\u00ec n\u1ebfu t\u00f4i mu\u1ed1n t\u00ednh chu vi tr\u00f2n c\u1ee7a l\u1edbp 5? V\u00ed d\u1ee5 minh h\u1ecda (v\u1edbi c\u00e2u tr\u1ea3 l\u1eddi chi ti\u1ebft)<\/li>\n<\/ol>\n<p dir=\"ltr\">B\u00e0i t\u1eadp 7: \u0110\u1ed1i v\u1edbi h\u00ecnh b\u00ecnh h\u00e0nh v\u1edbi di\u1ec7n t\u00edch 45 cm2 v\u00e0 m\u1ed9t b\u00ean l\u00e0 5 cm. T\u00ednh chi\u1ec1u d\u00e0i c\u1ea1nh c\u00f2n l\u1ea1i.<\/p>\n<p dir=\"ltr\">Tr\u1ea3 l\u1eddi:<\/p>\n<p dir=\"ltr\" style=\"text-align: center\">45 cm2 = 5.x cm<\/p>\n<p dir=\"ltr\" style=\"text-align: center\">x = 45 cm2 5 cm = 9 cm<\/p>\n<p dir=\"ltr\">B\u00e0i t\u1eadp 8: \u0110\u1ed1i v\u1edbi h\u00ecnh b\u00ecnh h\u00e0nh v\u1edbi di\u1ec7n t\u00edch 72 cm2 v\u00e0 m\u1ed9t b\u00ean l\u00e0 8 cm. T\u00ednh chi\u1ec1u d\u00e0i c\u1ea1nh c\u00f2n l\u1ea1i.<\/p>\n<p dir=\"ltr\">Tr\u1ea3 l\u1eddi:<\/p>\n<p dir=\"ltr\" style=\"text-align: center\">72 cm2 = 8.x cm<\/p>\n<p dir=\"ltr\" style=\"text-align: center\">x = 72 cm2 8 cm = 9 cm<\/p>\n<p dir=\"ltr\"><img decoding=\"async\" class=\"lazyload\" src=\"https:\/\/external-content.duckduckgo.com\/iu\/?u=https:\/\/vnmedia2.monkeyuni.net\/upload\/web\/img\/7-hinh-binh-hanh-lop-4.png\" alt=\"H\u00ecnh \u1ea3nh c\u1ee7a l\u1edbp 4. (\u1ea2nh: B\u1ed9 s\u01b0u t\u1eadp Internet)\" width=\"100%\"><\/p>\n<\/p>\n<p dir=\"ltr\">Hy v\u1ecdng c\u00e1c b\u00e0i t\u1eadp tr\u00ean s\u1ebd gi\u00fap b\u1ea1n xem x\u00e9t v\u00e0 l\u00e0m ch\u1ee7 ki\u1ebfn \u200b\u200bth\u1ee9c v\u1ec1 h\u00ecnh b\u00ecnh h\u00e0nh l\u1edbp th\u1ee9 4. Vui l\u00f2ng theo d\u00f5i kh\u1ec9 \u0111\u1ec3 xem x\u00e9t ki\u1ebfn \u200b\u200bth\u1ee9c v\u1ec1 to\u00e1n h\u1ecdc theo c\u00e1ch ch\u00ednh x\u00e1c nh\u1ea5t.<\/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>H\u00ecnh b\u00ecnh h\u00e0nh l\u00e0 m\u1ed9t kh\u1ed1i h\u00ecnh h\u1ecdc ph\u1ed5 bi\u1ebfn m\u00e0 ch\u00fang ta th\u01b0\u1eddng g\u1eb7p trong cu\u1ed9c s\u1ed1ng h\u00e0ng ng\u00e0y. Khi l\u1edbp 4, tr\u1ebb s\u1ebd b\u1eaft \u0111\u1ea7u h\u1ecdc ki\u1ebfn \u200b\u200bth\u1ee9c v\u1ec1 h\u00ecnh b\u00ecnh h\u00e0nh. Trong b\u00e0i vi\u1ebft n\u00e0y, Shining Home &#8211; Gia \u0111\u00ecnh Anh Ng\u1eef s\u1ebd cung c\u1ea5p cho b\u1ea1n m\u1ed9t c\u00e1i nh\u00ecn t\u1ed5ng quan&#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-14369","post","type-post","status-publish","format-standard","hentry","category-kien-thuc"],"_links":{"self":[{"href":"https:\/\/www.ckconitsha.com\/vn\/wp-json\/wp\/v2\/posts\/14369","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=14369"}],"version-history":[{"count":2,"href":"https:\/\/www.ckconitsha.com\/vn\/wp-json\/wp\/v2\/posts\/14369\/revisions"}],"predecessor-version":[{"id":17241,"href":"https:\/\/www.ckconitsha.com\/vn\/wp-json\/wp\/v2\/posts\/14369\/revisions\/17241"}],"wp:attachment":[{"href":"https:\/\/www.ckconitsha.com\/vn\/wp-json\/wp\/v2\/media?parent=14369"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ckconitsha.com\/vn\/wp-json\/wp\/v2\/categories?post=14369"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ckconitsha.com\/vn\/wp-json\/wp\/v2\/tags?post=14369"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}