{"id":620675,"date":"2026-11-09T09:25:47","date_gmt":"2026-11-09T02:25:47","guid":{"rendered":"https:\/\/hoanghamobile.com\/tin-tuc\/?p=620675"},"modified":"2026-11-09T09:25:47","modified_gmt":"2026-11-09T02:25:47","slug":"tu-dien-deu","status":"publish","type":"post","link":"https:\/\/hoanghamobile.com\/tin-tuc\/tu-dien-deu\/","title":{"rendered":"T\u1ee9 di\u1ec7n \u0111\u1ec1u l\u00e0 g\u00ec? T\u00ednh ch\u1ea5t, c\u00f4ng th\u1ee9c th\u1ec3 t\u00edch, b\u00e0i t\u1eadp"},"content":{"rendered":"<p style=\"text-align: justify;\"><b>T\u1ee9 di\u1ec7n \u0111\u1ec1u<\/b><span style=\"font-weight: 400;\"> l\u00e0 h\u00ecnh ch\u00f3p tam gi\u00e1c c\u00f3 4 m\u1eb7t \u0111\u1ec1u l\u00e0 tam gi\u00e1c \u0111\u1ec1u b\u1eb1ng nhau, 6 c\u1ea1nh b\u1eb1ng nhau v\u00e0 4 \u0111\u1ec9nh. V\u1edbi c\u1ea1nh b\u1eb1ng a, th\u1ec3 t\u00edch kh\u1ed1i h\u00ecnh t\u1ee9 di\u1ec7n l\u00e0 V = a\u00b3\u221a2\/12, chi\u1ec1u cao h = a\u221a6\/3 v\u00e0 di\u1ec7n t\u00edch to\u00e0n ph\u1ea7n S = a\u00b2\u221a3. T\u1ee9 di\u1ec7n l\u00e0 kh\u1ed1i \u0111a di\u1ec7n \u0111\u1ec1u \u0111\u01a1n gi\u1ea3n nh\u1ea5t trong n\u0103m lo\u1ea1i kh\u1ed1i \u0111a di\u1ec7n \u0111\u1ec1u. B\u00e0i vi\u1ebft n\u00e0y t\u1ed5ng h\u1ee3p t\u00ednh ch\u1ea5t, b\u1ea3ng c\u00f4ng th\u1ee9c, c\u00e1ch ch\u1ee9ng minh v\u00e0 4 b\u00e0i t\u1eadp c\u00f3 l\u1eddi gi\u1ea3i \u0111\u1ec3 b\u1ea1n \u00f4n nhanh ph\u1ea7n h\u00ecnh h\u1ecdc kh\u00f4ng gian l\u1edbp 12. B\u00e0i vi\u1ebft t\u1ed5ng h\u1ee3p \u0111\u1ecbnh ngh\u0129a, t\u00ednh ch\u1ea5t, to\u00e0n b\u1ed9 c\u00f4ng th\u1ee9c t\u00ednh v\u00e0 b\u00e0i t\u1eadp c\u00f3 l\u1eddi gi\u1ea3i.<\/span><\/p>\n<h2 style=\"text-align: justify;\"><b>T\u1ee9 di\u1ec7n \u0111\u1ec1u l\u00e0 g\u00ec?<\/b><\/h2>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">T\u1ee9 di\u1ec7n l\u00e0 h\u00ecnh g\u1ed3m 4 \u0111i\u1ec3m kh\u00f4ng \u0111\u1ed3ng ph\u1eb3ng A, B, C, D c\u00f9ng 4 tam gi\u00e1c ABC, ABD, ACD, BCD. <\/span><b>T\u1ee9 di\u1ec7n \u0111\u1ec1u<\/b><span style=\"font-weight: 400;\"> l\u00e0 tr\u01b0\u1eddng h\u1ee3p \u0111\u1eb7c bi\u1ec7t khi c\u1ea3 6 c\u1ea1nh AB, AC, AD, BC, BD, CD \u0111\u1ec1u b\u1eb1ng nhau, khi\u1ebfn 4 m\u1eb7t l\u00e0 4 tam gi\u00e1c \u0111\u1ec1u b\u1eb1ng nhau.<\/span><\/p>\n<p><img fetchpriority=\"high\" decoding=\"async\" class=\"aligncenter size-full wp-image-622375\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/11\/tu-dien-deu-1.jpg\" alt=\"tu-dien-deu-1\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/11\/tu-dien-deu-1.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/11\/tu-dien-deu-1-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/11\/tu-dien-deu-1-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">Trong h\u00ecnh h\u1ecdc kh\u00f4ng gian, kh\u1ed1i \u0111a di\u1ec7n \u0111\u1ec1u thu\u1ed9c lo\u1ea1i kh\u1ed1i \u0111a di\u1ec7n \u0111\u1ec1u {3; 3}: m\u1ed7i m\u1eb7t l\u00e0 tam gi\u00e1c (3 c\u1ea1nh) v\u00e0 m\u1ed7i \u0111\u1ec9nh l\u00e0 \u0111\u1ec9nh chung c\u1ee7a 3 m\u1eb7t. N\u0103m lo\u1ea1i kh\u1ed1i \u0111a di\u1ec7n \u0111\u1ec1u g\u1ed3m t\u1ee9 di\u1ec7n, l\u1eadp ph\u01b0\u01a1ng, b\u00e1t di\u1ec7n \u0111\u1ec1u, kh\u1ed1i 12 m\u1eb7t \u0111\u1ec1u v\u00e0 kh\u1ed1i 20 m\u1eb7t \u0111\u1ec1u.<\/span><\/p>\n<h2 style=\"text-align: justify;\"><b>T\u00ednh ch\u1ea5t c\u1ee7a t\u1ee9 di\u1ec7n \u0111\u1ec1u<\/b><\/h2>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">Trong h\u00ecnh h\u1ecdc kh\u00f4ng gian, h\u00ecnh n\u00e0y s\u1edf h\u1eefu nhi\u1ec1u \u0111\u1eb7c \u0111i\u1ec3m \u0111\u1ed1i x\u1ee9ng t\u1ea1o n\u00ean c\u1ea5u tr\u00fac \u0111\u1eb7c tr\u01b0ng c\u1ee7a kh\u1ed1i h\u00ecnh n\u00e0y. Nh\u1eefng t\u00ednh ch\u1ea5t c\u01a1 b\u1ea3n s\u1ebd l\u00e0 n\u1ec1n t\u1ea3ng gi\u00fap b\u1ea1n ti\u1ebfp c\u1eadn c\u00e1c d\u1ea1ng b\u00e0i t\u1eadp v\u00e0 c\u00f4ng th\u1ee9c li\u00ean quan d\u1ec5 d\u00e0ng h\u01a1n.<\/span><\/p>\n<ul style=\"text-align: justify;\">\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">M\u1ecdi m\u1eb7t \u0111\u1ec1u l\u00e0 tam gi\u00e1c \u0111\u1ec1u: c\u00f3 th\u1ec3 ch\u1ecdn b\u1ea5t k\u1ef3 m\u1eb7t n\u00e0o l\u00e0m \u0111\u00e1y, \u0111\u1ec9nh c\u00f2n l\u1ea1i l\u00e0 \u0111\u1ec9nh c\u1ee7a h\u00ecnh ch\u00f3p tam gi\u00e1c \u0111\u1ec1u.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Ch\u00e2n \u0111\u01b0\u1eddng cao tr\u00f9ng tr\u1ecdng t\u00e2m \u0111\u00e1y: \u0111\u01b0\u1eddng cao h\u1ea1 t\u1eeb m\u1ed9t \u0111\u1ec9nh r\u01a1i \u0111\u00fang v\u00e0o tr\u1ecdng t\u00e2m (c\u0169ng l\u00e0 t\u00e2m \u0111\u01b0\u1eddng tr\u00f2n ngo\u1ea1i ti\u1ebfp) c\u1ee7a m\u1eb7t \u0111\u1ed1i di\u1ec7n.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Hai c\u1ea1nh \u0111\u1ed1i vu\u00f4ng g\u00f3c: AB \u22a5 CD, AC \u22a5 BD, AD \u22a5 BC.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">\u0110o\u1ea1n vu\u00f4ng g\u00f3c chung: \u0111o\u1ea1n n\u1ed1i trung \u0111i\u1ec3m hai c\u1ea1nh \u0111\u1ed1i l\u00e0 \u0111\u01b0\u1eddng vu\u00f4ng g\u00f3c chung, c\u00f3 \u0111\u1ed9 d\u00e0i a\u221a2\/2.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">T\u00e2m tr\u00f9ng nhau: t\u00e2m m\u1eb7t c\u1ea7u ngo\u1ea1i ti\u1ebfp, t\u00e2m m\u1eb7t c\u1ea7u n\u1ed9i ti\u1ebfp v\u00e0 tr\u1ecdng t\u00e2m t\u1ee9 di\u1ec7n l\u00e0 m\u1ed9t \u0111i\u1ec3m, n\u1eb1m tr\u00ean \u0111\u01b0\u1eddng cao v\u00e0 c\u00e1ch \u0111\u00e1y m\u1ed9t ph\u1ea7n t\u01b0 \u0111\u01b0\u1eddng cao.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">C\u00f3 6 m\u1eb7t ph\u1eb3ng \u0111\u1ed1i x\u1ee9ng: m\u1ed7i m\u1eb7t ph\u1eb3ng ch\u1ee9a m\u1ed9t c\u1ea1nh v\u00e0 trung \u0111i\u1ec3m c\u1ea1nh \u0111\u1ed1i di\u1ec7n.<\/span><\/li>\n<\/ul>\n<p><img decoding=\"async\" class=\"aligncenter size-full wp-image-622376\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/11\/tu-dien-deu-2.jpg\" alt=\"tu-dien-deu-2\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/11\/tu-dien-deu-2.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/11\/tu-dien-deu-2-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/11\/tu-dien-deu-2-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p>\n<h2 style=\"text-align: justify;\"><b>C\u00f4ng th\u1ee9c t\u1ee9 di\u1ec7n \u0111\u1ec1u c\u1ea1nh a<\/b><\/h2>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">\u0110\u00e2y l\u00e0 m\u1ed9t h\u00ecnh kh\u1ed1i kh\u00f4ng gian c\u00f3 nh\u1eefng \u0111\u1eb7c \u0111i\u1ec3m h\u00ecnh h\u1ecdc v\u00e0 t\u00ednh ch\u1ea5t ri\u00eang bi\u1ec7t. Vi\u1ec7c t\u1ed5ng h\u1ee3p c\u00e1c c\u00f4ng th\u1ee9c li\u00ean quan \u0111\u1ebfn t\u1ee9 di\u1ec7n c\u1ea1nh a \u0111\u1ec1u s\u1ebd gi\u00fap b\u1ea1n thu\u1eadn ti\u1ec7n h\u01a1n khi h\u1ecdc t\u1eadp, ghi nh\u1edb v\u00e0 gi\u1ea3i c\u00e1c b\u00e0i to\u00e1n h\u00ecnh h\u1ecdc kh\u00f4ng gian.<\/span><\/p>\n<table>\n<tbody>\n<tr>\n<td><b>\u0110\u1ea1i l\u01b0\u1ee3ng<\/b><\/td>\n<td><b>C\u00f4ng th\u1ee9c<\/b><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Di\u1ec7n t\u00edch m\u1ed9t m\u1eb7t<\/span><\/td>\n<td><span style=\"font-weight: 400;\">S = a\u00b2\u221a3\/4<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Di\u1ec7n t\u00edch to\u00e0n ph\u1ea7n<\/span><\/td>\n<td><span style=\"font-weight: 400;\">S<\/span><span style=\"font-weight: 400;\">tp<\/span><span style=\"font-weight: 400;\"> = a\u00b2\u221a3<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Chi\u1ec1u cao<\/span><\/td>\n<td><span style=\"font-weight: 400;\">h = a\u221a6\/3<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Th\u1ec3 t\u00edch<\/span><\/td>\n<td><span style=\"font-weight: 400;\">V = a\u00b3\u221a2\/12<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">B\u00e1n k\u00ednh m\u1eb7t c\u1ea7u ngo\u1ea1i ti\u1ebfp<\/span><\/td>\n<td><span style=\"font-weight: 400;\">R = a\u221a6\/4<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">B\u00e1n k\u00ednh m\u1eb7t c\u1ea7u n\u1ed9i ti\u1ebfp<\/span><\/td>\n<td><span style=\"font-weight: 400;\">r = a\u221a6\/12<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Kho\u1ea3ng c\u00e1ch gi\u1eefa hai c\u1ea1nh \u0111\u1ed1i<\/span><\/td>\n<td><span style=\"font-weight: 400;\">d = a\u221a2\/2<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">G\u00f3c gi\u1eefa c\u1ea1nh b\u00ean v\u00e0 m\u1eb7t \u0111\u00e1y<\/span><\/td>\n<td><span style=\"font-weight: 400;\">cos\u03c6 = 1\/\u221a3 (\u03c6 \u2248 54,74\u00b0)<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">G\u00f3c gi\u1eefa hai m\u1eb7t (g\u00f3c nh\u1ecb di\u1ec7n)<\/span><\/td>\n<td><span style=\"font-weight: 400;\">cos\u03b1 = 1\/3 (\u03b1 \u2248 70,53\u00b0)<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">L\u01b0u \u00fd R = 3r v\u00e0 R + r = h: t\u00e2m m\u1eb7t c\u1ea7u n\u1eb1m tr\u00ean \u0111\u01b0\u1eddng cao, c\u00e1ch \u0111\u1ec9nh 3\/4 \u0111\u01b0\u1eddng cao v\u00e0 c\u00e1ch \u0111\u00e1y 1\/4 \u0111\u01b0\u1eddng cao.<\/span><\/p>\n<h2 style=\"text-align: justify;\"><b>Ch\u1ee9ng minh c\u00f4ng th\u1ee9c chi\u1ec1u cao v\u00e0 th\u1ec3 t\u00edch<\/b><\/h2>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">G\u1ecdi<\/span><b> t\u1ee9 di\u1ec7n \u0111\u1ec1u<\/b><span style=\"font-weight: 400;\"> ABCD c\u1ea1nh a, G l\u00e0 tr\u1ecdng t\u00e2m tam gi\u00e1c BCD. Khi \u0111\u00f3 AG l\u00e0 \u0111\u01b0\u1eddng cao c\u1ee7a t\u1ee9 di\u1ec7n.<\/span><\/p>\n<ul style=\"text-align: justify;\">\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>T\u00ednh BG:<\/b><span style=\"font-weight: 400;\"> \u0111\u01b0\u1eddng trung tuy\u1ebfn c\u1ee7a tam gi\u00e1c \u0111\u1ec1u c\u1ea1nh a b\u1eb1ng a\u221a3\/2, n\u00ean BG = (2\/3)\u00b7(a\u221a3\/2) = a\u221a3\/3.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>T\u00ednh AG:<\/b><span style=\"font-weight: 400;\"> tam gi\u00e1c ABG vu\u00f4ng t\u1ea1i G, theo<\/span><a href=\"https:\/\/hoanghamobile.com\/tin-tuc\/dinh-ly-pytago\/\"> <span style=\"font-weight: 400;\">\u0111\u1ecbnh l\u00fd Pytago<\/span><\/a><span style=\"font-weight: 400;\">: AG\u00b2 = AB\u00b2 \u2212 BG\u00b2 = a\u00b2 \u2212 a\u00b2\/3 = 2a\u00b2\/3, suy ra h = AG = a\u221a6\/3.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>T\u00ednh th\u1ec3 t\u00edch:<\/b><span style=\"font-weight: 400;\"> di\u1ec7n t\u00edch \u0111\u00e1y BCD b\u1eb1ng a\u00b2\u221a3\/4 (xem th\u00eam<\/span><a href=\"https:\/\/hoanghamobile.com\/tin-tuc\/cach-tinh-dien-tich-tam-giac-deu\/\"> <span style=\"font-weight: 400;\">di\u1ec7n t\u00edch tam gi\u00e1c \u0111\u1ec1u<\/span><\/a><span style=\"font-weight: 400;\">). Do \u0111\u00f3 V = (1\/3)\u00b7(a\u00b2\u221a3\/4)\u00b7(a\u221a6\/3) = a\u00b3\u221a18\/36 = a\u00b3\u221a2\/12.<\/span><\/li>\n<\/ul>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">C\u00f4ng th\u1ee9c V = (1\/3)\u00b7S<\/span><span style=\"font-weight: 400;\">\u0111\u00e1y<\/span><span style=\"font-weight: 400;\">\u00b7h l\u00e0 c\u00f4ng th\u1ee9c chung c\u1ee7a m\u1ecdi kh\u1ed1i ch\u00f3p, b\u1ea1n c\u00f3 th\u1ec3 \u00f4n l\u1ea1i trong b\u00e0i<\/span><a href=\"https:\/\/hoanghamobile.com\/tin-tuc\/the-tich-khoi-chop\/\"> <span style=\"font-weight: 400;\">th\u1ec3 t\u00edch kh\u1ed1i ch\u00f3p<\/span><\/a><span style=\"font-weight: 400;\">.<\/span><\/p>\n<p><img decoding=\"async\" class=\"aligncenter size-full wp-image-622377\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/11\/tu-dien-deu-3.jpg\" alt=\"tu-dien-deu-3\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/11\/tu-dien-deu-3.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/11\/tu-dien-deu-3-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/11\/tu-dien-deu-3-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p>\n<h2 style=\"text-align: justify;\"><b>Ch\u1ee9ng minh b\u00e1n k\u00ednh m\u1eb7t c\u1ea7u ngo\u1ea1i ti\u1ebfp v\u00e0 n\u1ed9i ti\u1ebfp<\/b><\/h2>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">T\u00e2m O c\u1ee7a m\u1eb7t c\u1ea7u ngo\u1ea1i ti\u1ebfp n\u1eb1m tr\u00ean \u0111\u01b0\u1eddng cao AG v\u00e0 c\u00e1ch \u0111\u1ec1u 4 \u0111\u1ec9nh.<\/span><\/p>\n<ul style=\"text-align: justify;\">\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">\u0110\u1eb7t OA = OB = R, OG = h \u2212 R. Trong tam gi\u00e1c vu\u00f4ng OBG: R\u00b2 = BG\u00b2 + (h \u2212 R)\u00b2.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Thay BG\u00b2 = a\u00b2\/3, h = a\u221a6\/3 v\u00e0 gi\u1ea3i ra \u0111\u01b0\u1ee3c R = a\u221a6\/4.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">B\u00e1n k\u00ednh m\u1eb7t c\u1ea7u n\u1ed9i ti\u1ebfp ch\u00ednh l\u00e0 kho\u1ea3ng c\u00e1ch t\u1eeb O \u0111\u1ebfn \u0111\u00e1y: r = OG = h \u2212 R = a\u221a6\/3 \u2212 a\u221a6\/4 = a\u221a6\/12.<\/span><\/li>\n<\/ul>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">Khi \u0111\u00e3 c\u00f3 R, di\u1ec7n t\u00edch v\u00e0 th\u1ec3 t\u00edch m\u1eb7t c\u1ea7u ngo\u1ea1i ti\u1ebfp t\u00ednh theo c\u00f4ng th\u1ee9c trong b\u00e0i<\/span><a href=\"https:\/\/hoanghamobile.com\/tin-tuc\/the-tich-khoi-cau\/\"> <span style=\"font-weight: 400;\">th\u1ec3 t\u00edch kh\u1ed1i c\u1ea7u<\/span><\/a><span style=\"font-weight: 400;\">.\u00a0<\/span><\/p>\n<h2 style=\"text-align: justify;\"><b>B\u00e0i t\u1eadp t\u1ee9 di\u1ec7n \u0111\u1ec1u c\u00f3 l\u1eddi gi\u1ea3i<\/b><\/h2>\n<p style=\"text-align: justify;\"><b>B\u00e0i 1: Cho t\u1ee9 di\u1ec7n \u0111\u1ec1u c\u1ea1nh a = 6 cm. T\u00ednh th\u1ec3 t\u00edch, chi\u1ec1u cao v\u00e0 di\u1ec7n t\u00edch to\u00e0n ph\u1ea7n.<\/b><\/p>\n<ul style=\"text-align: justify;\">\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">V = 6\u00b3\u00b7\u221a2\/12 = 216\u221a2\/12 = 18\u221a2 cm\u00b3 \u2248 25,46 cm\u00b3.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">h = 6\u221a6\/3 = 2\u221a6 cm \u2248 4,90 cm.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Stp = 6\u00b2\u00b7\u221a3 = 36\u221a3 cm\u00b2 \u2248 62,35 cm\u00b2.<\/span><\/li>\n<\/ul>\n<p style=\"text-align: justify;\"><b>B\u00e0i 2: T\u00ednh b\u00e1n k\u00ednh m\u1eb7t c\u1ea7u ngo\u1ea1i ti\u1ebfp t\u1ee9 di\u1ec7n \u0111\u1ec1u c\u1ea1nh 6 cm.<\/b><\/p>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">R = 6\u221a6\/4 = 3\u221a6\/2 cm \u2248 3,67 cm; khi \u0111\u00f3 r = R\/3 = \u221a6\/2 cm \u2248 1,22 cm.<\/span><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-622378\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/11\/tu-dien-deu-4.jpg\" alt=\"tu-dien-deu-4\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/11\/tu-dien-deu-4.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/11\/tu-dien-deu-4-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/11\/tu-dien-deu-4-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p>\n<p style=\"text-align: justify;\"><b>B\u00e0i 3: T\u1ee9 di\u1ec7n \u0111\u1ec1u c\u00f3 th\u1ec3 t\u00edch b\u1eb1ng 18\u221a2. T\u00ednh \u0111\u1ed9 d\u00e0i c\u1ea1nh.<\/b><\/p>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">a\u00b3\u221a2\/12 = 18\u221a2 \u21d4 a\u00b3 = 216 \u21d4 a = 6.<\/span><\/p>\n<p style=\"text-align: justify;\"><b>B\u00e0i 4: T\u00ednh kho\u1ea3ng c\u00e1ch gi\u1eefa hai c\u1ea1nh \u0111\u1ed1i AB v\u00e0 CD c\u1ee7a t\u1ee9 di\u1ec7n \u0111\u1ec1u c\u1ea1nh a.<\/b><\/p>\n<ul style=\"text-align: justify;\">\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">G\u1ecdi M, N l\u00e0 trung \u0111i\u1ec3m AB, CD. Ta c\u00f3 AN = BN = a\u221a3\/2 n\u00ean tam gi\u00e1c ANB c\u00e2n, MN \u22a5 AB; t\u01b0\u01a1ng t\u1ef1 MN \u22a5 CD.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">MN\u00b2 = AN\u00b2 \u2212 AM\u00b2 = 3a\u00b2\/4 \u2212 a\u00b2\/4 = a\u00b2\/2, suy ra d(AB, CD) = a\u221a2\/2.<\/span><\/li>\n<\/ul>\n<h2 style=\"text-align: justify;\"><b>T\u1ee9 di\u1ec7n \u0111\u1ec1u kh\u00e1c h\u00ecnh ch\u00f3p tam gi\u00e1c \u0111\u1ec1u th\u1ebf n\u00e0o?<\/b><\/h2>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">D\u00f9 c\u00f3 chung d\u1ea1ng c\u1ea5u t\u1ea1o v\u1edbi \u0111\u00e1y tam gi\u00e1c, hai kh\u1ed1i h\u00ecnh n\u00e0y v\u1eabn c\u00f3 nh\u1eefng \u0111\u1eb7c \u0111i\u1ec3m ri\u00eang c\u1ea7n ph\u00e2n bi\u1ec7t. Ph\u1ea7n d\u01b0\u1edbi \u0111\u00e2y s\u1ebd gi\u00fap b\u1ea1n c\u00f3 c\u00e1i nh\u00ecn t\u1ed5ng quan h\u01a1n v\u1ec1 s\u1ef1 kh\u00e1c nhau gi\u1eefa t\u1ee9 di\u1ec7n h\u00ecnh \u0111\u1ec1u v\u00e0 h\u00ecnh ch\u00f3p tam gi\u00e1c \u0111\u1ec1u.<\/span><\/p>\n<table>\n<tbody>\n<tr>\n<td><b>Ti\u00eau ch\u00ed<\/b><\/td>\n<td><b>H\u00ecnh ch\u00f3p tam gi\u00e1c \u0111\u1ec1u<\/b><\/td>\n<td><b>T\u1ee9 di\u1ec7n \u0111\u1ec1u<\/b><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">M\u1eb7t \u0111\u00e1y<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Tam gi\u00e1c \u0111\u1ec1u<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Tam gi\u00e1c \u0111\u1ec1u<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">C\u1ea1nh b\u00ean<\/span><\/td>\n<td><span style=\"font-weight: 400;\">B\u1eb1ng nhau, c\u00f3 th\u1ec3 kh\u00e1c c\u1ea1nh \u0111\u00e1y<\/span><\/td>\n<td><span style=\"font-weight: 400;\">B\u1eb1ng c\u1ea1nh \u0111\u00e1y<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">M\u1eb7t b\u00ean<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Tam gi\u00e1c c\u00e2n<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Tam gi\u00e1c \u0111\u1ec1u<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Ch\u1ecdn \u0111\u00e1y<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Ch\u1ec9 m\u1ed9t m\u1eb7t l\u00e0 \u0111\u00e1y<\/span><\/td>\n<td><span style=\"font-weight: 400;\">M\u1eb7t n\u00e0o c\u0169ng c\u00f3 th\u1ec3 l\u00e0m \u0111\u00e1y<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2 style=\"text-align: justify;\"><b>T\u1ee9 di\u1ec7n \u0111\u1ec1u xu\u1ea5t hi\u1ec7n \u1edf \u0111\u00e2u trong th\u1ef1c t\u1ebf?<\/b><\/h2>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">Kh\u00f4ng ch\u1ec9 xu\u1ea5t hi\u1ec7n trong c\u00e1c b\u00e0i to\u00e1n h\u00ecnh h\u1ecdc, h\u00ecnh \u0111a di\u1ec7n \u0111\u1ec1u c\u00f2n c\u00f3 m\u1eb7t trong nhi\u1ec1u l\u0129nh v\u1ef1c c\u1ee7a \u0111\u1eddi s\u1ed1ng, t\u1eeb ki\u1ebfn tr\u00fac, thi\u1ebft k\u1ebf \u0111\u1ebfn khoa h\u1ecdc v\u00e0 t\u1ef1 nhi\u00ean. Nh\u1eefng v\u00ed d\u1ee5 th\u1ef1c t\u1ebf d\u01b0\u1edbi \u0111\u00e2y s\u1ebd gi\u00fap b\u1ea1n h\u00ecnh dung r\u00f5 h\u01a1n v\u1ec1 t\u00ednh \u1ee9ng d\u1ee5ng c\u1ee7a kh\u1ed1i h\u00ecnh n\u00e0y.<\/span><\/p>\n<ul style=\"text-align: justify;\">\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Ph\u00e2n t\u1eed metan (CH\u2084): nguy\u00ean t\u1eed cacbon n\u1eb1m \u1edf t\u00e2m, 4 nguy\u00ean t\u1eed hi\u0111ro n\u1eb1m \u1edf 4 \u0111\u1ec9nh c\u1ee7a m\u1ed9t t\u1ee9 di\u1ec7n \u0111\u1ec1u; g\u00f3c li\u00ean k\u1ebft H\u2013C\u2013H x\u1ea5p x\u1ec9 109,5\u00b0.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">X\u00fac x\u1eafc 4 m\u1eb7t: lo\u1ea1i x\u00fac x\u1eafc d\u00f9ng trong m\u1ed9t s\u1ed1 tr\u00f2 ch\u01a1i nh\u1eadp vai c\u00f3 d\u1ea1ng t\u1ee9 di\u1ec7n \u0111\u1ec1u.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">K\u1ebft c\u1ea5u khung: nhi\u1ec1u k\u1ebft c\u1ea5u gi\u00e0n kh\u00f4ng gian gh\u00e9p t\u1eeb c\u00e1c kh\u1ed1i t\u1ee9 di\u1ec7n v\u00ec h\u00ecnh n\u00e0y r\u1ea5t c\u1ee9ng, kh\u00f3 bi\u1ebfn d\u1ea1ng.<\/span><\/li>\n<\/ul>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-622379\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/11\/tu-dien-deu-5.jpg\" alt=\"tu-dien-deu-5\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/11\/tu-dien-deu-5.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/11\/tu-dien-deu-5-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/11\/tu-dien-deu-5-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p>\n<h2 style=\"text-align: justify;\"><b>C\u00e2u h\u1ecfi th\u01b0\u1eddng g\u1eb7p v\u1ec1 t\u1ee9 di\u1ec7n \u0111\u1ec1u<\/b><\/h2>\n<h3 style=\"text-align: justify;\"><b>T\u1ee9 di\u1ec7n \u0111\u1ec1u c\u00f3 bao nhi\u00eau c\u1ea1nh, bao nhi\u00eau m\u1eb7t?<\/b><\/h3>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">T\u1ee9 di\u1ec7n \u0111\u1ec1u c\u00f3 4 \u0111\u1ec9nh, 6 c\u1ea1nh b\u1eb1ng nhau v\u00e0 4 m\u1eb7t l\u00e0 tam gi\u00e1c \u0111\u1ec1u.<\/span><\/p>\n<h3 style=\"text-align: justify;\"><b>C\u00f4ng th\u1ee9c th\u1ec3 t\u00edch t\u1ee9 di\u1ec7n \u0111\u1ec1u l\u00e0 g\u00ec?<\/b><\/h3>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">Th\u1ec3 t\u00edch kh\u1ed1i t\u1ee9 di\u1ec7n \u0111\u1ec1u c\u1ea1nh a l\u00e0 V = a\u00b3\u221a2\/12.<\/span><\/p>\n<h3 style=\"text-align: justify;\"><b>Chi\u1ec1u cao c\u1ee7a t\u1ee9 di\u1ec7n \u0111\u1ec1u c\u1ea1nh a b\u1eb1ng bao nhi\u00eau?<\/b><\/h3>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">Chi\u1ec1u cao c\u1ee7a t\u1ee9 di\u1ec7n \u0111\u1ec1u c\u1ea1nh a l\u00e0 h = a\u221a6\/3, \u0111\u01b0\u1eddng cao h\u1ea1 t\u1eeb m\u1ed9t \u0111\u1ec9nh xu\u1ed1ng tr\u1ecdng t\u00e2m m\u1eb7t \u0111\u1ed1i di\u1ec7n.<\/span><\/p>\n<h3 style=\"text-align: justify;\"><b>T\u1ee9 di\u1ec7n \u0111\u1ec1u c\u00f3 bao nhi\u00eau m\u1eb7t ph\u1eb3ng \u0111\u1ed1i x\u1ee9ng?<\/b><\/h3>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">T\u1ee9 di\u1ec7n \u0111\u1ec1u c\u00f3 6 m\u1eb7t ph\u1eb3ng \u0111\u1ed1i x\u1ee9ng, m\u1ed7i m\u1eb7t ph\u1eb3ng \u0111i qua m\u1ed9t c\u1ea1nh v\u00e0 trung \u0111i\u1ec3m c\u1ee7a c\u1ea1nh \u0111\u1ed1i di\u1ec7n.<\/span><\/p>\n<h3 style=\"text-align: justify;\"><b>B\u00e1n k\u00ednh m\u1eb7t c\u1ea7u ngo\u1ea1i ti\u1ebfp t\u1ee9 di\u1ec7n \u0111\u1ec1u l\u00e0 bao nhi\u00eau?<\/b><\/h3>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">B\u00e1n k\u00ednh m\u1eb7t c\u1ea7u ngo\u1ea1i ti\u1ebfp t\u1ee9 di\u1ec7n \u0111\u1ec1u c\u1ea1nh a l\u00e0 R = a\u221a6\/4, g\u1ea5p 3 l\u1ea7n b\u00e1n k\u00ednh m\u1eb7t c\u1ea7u n\u1ed9i ti\u1ebfp r = a\u221a6\/12.<\/span><\/p>\n<h3 style=\"text-align: justify;\"><b>Hai c\u1ea1nh \u0111\u1ed1i c\u1ee7a t\u1ee9 di\u1ec7n \u0111\u1ec1u c\u00f3 vu\u00f4ng g\u00f3c kh\u00f4ng?<\/b><\/h3>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">C\u00f3. Trong t\u1ee9 di\u1ec7n \u0111\u1ec1u, m\u1ecdi c\u1eb7p c\u1ea1nh \u0111\u1ed1i \u0111\u1ec1u vu\u00f4ng g\u00f3c v\u1edbi nhau v\u00e0 kho\u1ea3ng c\u00e1ch gi\u1eefa ch\u00fang b\u1eb1ng a\u221a2\/2.<\/span><\/p>\n<p><script type=\"application\/ld+json\">{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"T\u1ee9 di\u1ec7n \u0111\u1ec1u c\u00f3 bao nhi\u00eau c\u1ea1nh, bao nhi\u00eau m\u1eb7t?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"T\u1ee9 di\u1ec7n \u0111\u1ec1u c\u00f3 4 \u0111\u1ec9nh, 6 c\u1ea1nh b\u1eb1ng nhau v\u00e0 4 m\u1eb7t l\u00e0 tam gi\u00e1c \u0111\u1ec1u.\"}}, {\"@type\": \"Question\", \"name\": \"C\u00f4ng th\u1ee9c th\u1ec3 t\u00edch t\u1ee9 di\u1ec7n \u0111\u1ec1u l\u00e0 g\u00ec?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Th\u1ec3 t\u00edch kh\u1ed1i t\u1ee9 di\u1ec7n \u0111\u1ec1u c\u1ea1nh a l\u00e0 V = a\u00b3\u221a2\/12.\"}}, {\"@type\": \"Question\", \"name\": \"Chi\u1ec1u cao c\u1ee7a t\u1ee9 di\u1ec7n \u0111\u1ec1u c\u1ea1nh a b\u1eb1ng bao nhi\u00eau?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Chi\u1ec1u cao c\u1ee7a t\u1ee9 di\u1ec7n \u0111\u1ec1u c\u1ea1nh a l\u00e0 h = a\u221a6\/3, \u0111\u01b0\u1eddng cao h\u1ea1 t\u1eeb m\u1ed9t \u0111\u1ec9nh xu\u1ed1ng tr\u1ecdng t\u00e2m m\u1eb7t \u0111\u1ed1i di\u1ec7n.\"}}, {\"@type\": \"Question\", \"name\": \"T\u1ee9 di\u1ec7n \u0111\u1ec1u c\u00f3 bao nhi\u00eau m\u1eb7t ph\u1eb3ng \u0111\u1ed1i x\u1ee9ng?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"T\u1ee9 di\u1ec7n \u0111\u1ec1u c\u00f3 6 m\u1eb7t ph\u1eb3ng \u0111\u1ed1i x\u1ee9ng, m\u1ed7i m\u1eb7t ph\u1eb3ng \u0111i qua m\u1ed9t c\u1ea1nh v\u00e0 trung \u0111i\u1ec3m c\u1ee7a c\u1ea1nh \u0111\u1ed1i di\u1ec7n.\"}}, {\"@type\": \"Question\", \"name\": \"B\u00e1n k\u00ednh m\u1eb7t c\u1ea7u ngo\u1ea1i ti\u1ebfp t\u1ee9 di\u1ec7n \u0111\u1ec1u l\u00e0 bao nhi\u00eau?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"B\u00e1n k\u00ednh m\u1eb7t c\u1ea7u ngo\u1ea1i ti\u1ebfp t\u1ee9 di\u1ec7n \u0111\u1ec1u c\u1ea1nh a l\u00e0 R = a\u221a6\/4, g\u1ea5p 3 l\u1ea7n b\u00e1n k\u00ednh m\u1eb7t c\u1ea7u n\u1ed9i ti\u1ebfp r = a\u221a6\/12.\"}}, {\"@type\": \"Question\", \"name\": \"Hai c\u1ea1nh \u0111\u1ed1i c\u1ee7a t\u1ee9 di\u1ec7n \u0111\u1ec1u c\u00f3 vu\u00f4ng g\u00f3c kh\u00f4ng?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"C\u00f3. Trong t\u1ee9 di\u1ec7n \u0111\u1ec1u, m\u1ecdi c\u1eb7p c\u1ea1nh \u0111\u1ed1i \u0111\u1ec1u vu\u00f4ng g\u00f3c v\u1edbi nhau v\u00e0 kho\u1ea3ng c\u00e1ch gi\u1eefa ch\u00fang b\u1eb1ng a\u221a2\/2.\"}}]}<\/script><\/p>\n<h2 style=\"text-align: justify;\"><b>K\u1ebft lu\u1eadn<\/b><\/h2>\n<p style=\"text-align: justify;\"><b>T\u1ee9 di\u1ec7n \u0111\u1ec1u <\/b><span style=\"font-weight: 400;\">l\u00e0 kh\u1ed1i \u0111a di\u1ec7n \u0111\u1ec1u c\u00f3 4 m\u1eb7t tam gi\u00e1c \u0111\u1ec1u v\u00e0 6 c\u1ea1nh b\u1eb1ng nhau. B\u1ea1n c\u1ea7n nh\u1edb ba c\u00f4ng th\u1ee9c c\u1ed1t l\u00f5i: chi\u1ec1u cao h = a\u221a6\/3, th\u1ec3 t\u00edch V = a\u00b3\u221a2\/12 v\u00e0 b\u00e1n k\u00ednh m\u1eb7t c\u1ea7u ngo\u1ea1i ti\u1ebfp R = a\u221a6\/4; c\u00e1c \u0111\u1ea1i l\u01b0\u1ee3ng kh\u00e1c \u0111\u1ec1u suy ra t\u1eeb \u0111\u1ecbnh l\u00fd Pytago v\u00e0 t\u00ednh ch\u1ea5t tr\u1ecdng t\u00e2m. Luy\u1ec7n b\u1ed1n b\u00e0i t\u1eadp \u1edf tr\u00ean s\u1ebd gi\u00fap b\u1ea1n x\u1eed l\u00fd nhanh c\u00e1c c\u00e2u h\u1ecfi h\u00ecnh \u0111a di\u1ec7n \u0111\u1ec1u trong \u0111\u1ec1 ki\u1ec3m tra v\u00e0 \u0111\u1ec1 thi.<\/span><\/p>\n<p style=\"text-align: justify;\"><b>Xem th\u00eam:<\/b><\/p>\n<ul>\n<li>\n<p class=\"elementor-heading-title elementor-size-default\"><a href=\"https:\/\/hoanghamobile.com\/tin-tuc\/tai-phan-mem-geogebra\/\">GeoGebra \u2013 Ph\u1ea7n m\u1ec1m v\u1ebd \u0111\u1ed3 th\u1ecb h\u00e0m s\u1ed1, c\u00f4ng th\u1ee9c To\u00e1n h\u1ecdc<\/a><\/p>\n<\/li>\n<li>\n<p class=\"elementor-heading-title elementor-size-default\"><a href=\"https:\/\/hoanghamobile.com\/tin-tuc\/so-huu-ti-la-gi\/\">S\u1ed1 h\u1eefu t\u1ec9 l\u00e0 g\u00ec? S\u1ed1 v\u00f4 t\u1ec9 l\u00e0 g\u00ec? \u0110\u1eb7c tr\u01b0ng c\u1ee7a c\u00e1c s\u1ed1 trong To\u00e1n h\u1ecdc<\/a><\/p>\n<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>T\u1ee9 di\u1ec7n \u0111\u1ec1u l\u00e0 h\u00ecnh ch\u00f3p tam gi\u00e1c c\u00f3 4 m\u1eb7t \u0111\u1ec1u l\u00e0 tam gi\u00e1c \u0111\u1ec1u b\u1eb1ng nhau, 6 c\u1ea1nh b\u1eb1ng nhau v\u00e0 4 \u0111\u1ec9nh. V\u1edbi c\u1ea1nh b\u1eb1ng a, th\u1ec3 t\u00edch kh\u1ed1i h\u00ecnh t\u1ee9 di\u1ec7n l\u00e0 V = a\u00b3\u221a2\/12, chi\u1ec1u cao h = a\u221a6\/3 v\u00e0 di\u1ec7n t\u00edch to\u00e0n ph\u1ea7n S = a\u00b2\u221a3. T\u1ee9 di\u1ec7n l\u00e0 [&hellip;]<\/p>\n","protected":false},"author":84,"featured_media":622374,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_focuskw":"t\u1ee9 di\u1ec7n \u0111\u1ec1u","_yoast_wpseo_title":"T\u1ee9 di\u1ec7n \u0111\u1ec1u: T\u00ednh ch\u1ea5t, c\u00f4ng th\u1ee9c th\u1ec3 t\u00edch v\u00e0 b\u00e0i t\u1eadp","_yoast_wpseo_metadesc":"T\u1ee9 di\u1ec7n \u0111\u1ec1u l\u00e0 kh\u1ed1i c\u00f3 4 m\u1eb7t tam gi\u00e1c \u0111\u1ec1u v\u00e0 6 c\u1ea1nh b\u1eb1ng nhau. Xem t\u00ednh ch\u1ea5t, c\u00f4ng th\u1ee9c th\u1ec3 t\u00edch, chi\u1ec1u cao, b\u00e1n k\u00ednh c\u1ea7u v\u00e0 b\u00e0i t\u1eadp c\u00f3 l\u1eddi gi\u1ea3i ngay.","footnotes":""},"categories":[29235,3910,30453],"tags":[],"class_list":["post-620675","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-goc-to-mo","category-kham-pha","category-kien-thuc"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.3 (Yoast SEO v27.4) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>T\u1ee9 di\u1ec7n \u0111\u1ec1u: T\u00ednh ch\u1ea5t, c\u00f4ng th\u1ee9c th\u1ec3 t\u00edch v\u00e0 b\u00e0i t\u1eadp<\/title>\n<meta name=\"description\" content=\"T\u1ee9 di\u1ec7n \u0111\u1ec1u l\u00e0 kh\u1ed1i c\u00f3 4 m\u1eb7t tam gi\u00e1c \u0111\u1ec1u v\u00e0 6 c\u1ea1nh b\u1eb1ng nhau. 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