{"id":984,"date":"2026-02-07T06:49:10","date_gmt":"2026-02-07T06:49:10","guid":{"rendered":"https:\/\/arttao.net\/?page_id=984"},"modified":"2026-02-07T17:46:12","modified_gmt":"2026-02-07T17:46:12","slug":"b2-3-tam-giac","status":"publish","type":"page","link":"https:\/\/arttao.net\/vi\/b2-3%e3%80%81%e4%b8%89%e8%a7%92%e5%bd%a2\/","title":{"rendered":"B2-3, Tam gi\u00e1c"},"content":{"rendered":"<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<figure class=\"wp-block-image size-large has-custom-border\"><img decoding=\"async\" src=\"https:\/\/arttao.net\/wp-content\/uploads\/2026\/02\/2021-05-04T17_49_00.324Zu0022901-1800px-1024x847.jpg\" alt=\"\" class=\"wp-image-985\" style=\"border-top-left-radius:161px;border-top-right-radius:161px;border-bottom-left-radius:161px;border-bottom-right-radius:161px\"\/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><strong><br>3. Tam gi\u00e1c<\/strong><\/p>\n\n\n\n<figure class=\"wp-block-image size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"600\" height=\"600\" src=\"https:\/\/arttao.net\/wp-content\/uploads\/2026\/02\/Pokebowl-Sticker-by-Poke-Theory.gif\" alt=\"\" class=\"wp-image-986\" style=\"width:57px;height:auto\"\/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Trong h\u1ec7 th\u1ed1ng k\u00fd hi\u1ec7u h\u00ecnh h\u1ecdc c\u01a1 b\u1ea3n, h\u00ecnh tam gi\u00e1c l\u00e0 m\u1ed9t trong nh\u1eefng h\u00ecnh d\u1ea1ng n\u0103ng \u0111\u1ed9ng v\u00e0 c\u00f3 t\u00ednh \u0111\u1ecbnh h\u01b0\u1edbng cao nh\u1ea5t. Kh\u00f4ng gi\u1ed1ng nh\u01b0 s\u1ef1 kh\u00e9p k\u00edn li\u00ean t\u1ee5c c\u1ee7a h\u00ecnh tr\u00f2n v\u00e0 s\u1ef1 c\u00e2n b\u1eb1ng \u1ed5n \u0111\u1ecbnh c\u1ee7a h\u00ecnh vu\u00f4ng, h\u00ecnh tam gi\u00e1c t\u1ef1 nhi\u00ean ch\u1ee9a \u0111\u1ef1ng c\u00e1c y\u1ebfu t\u1ed1 kh\u00f4ng \u1ed5n \u0111\u1ecbnh trong c\u1ea5u tr\u00fac c\u1ee7a n\u00f3, v\u00e0 \u00fd ngh\u0129a bi\u1ec3u t\u01b0\u1ee3ng c\u1ee7a n\u00f3 \u0111\u01b0\u1ee3c t\u1ea1o ra t\u1eeb \u0111\u1eb7c \u0111i\u1ec3m c\u1ea5u tr\u00fac n\u00e0y. Ba c\u1ea1nh v\u00e0 ba g\u00f3c t\u1ea1o th\u00e0nh m\u1ed9t \u0111a gi\u00e1c kh\u00e9p k\u00edn t\u1ed1i thi\u1ec3u, mang l\u1ea1i cho h\u00ecnh tam gi\u00e1c c\u1ea3 t\u00ednh to\u00e0n v\u1eb9n l\u1eabn kh\u1ea3 n\u0103ng kh\u00f4ng th\u1ec3 \u0111\u1ea1t \u0111\u01b0\u1ee3c tr\u1ea1ng th\u00e1i ho\u00e0n to\u00e0n t\u0129nh t\u1ea1i.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">T\u1eeb g\u00f3c \u0111\u1ed9 h\u00ecnh h\u1ecdc, \u0111\u1eb7c \u0111i\u1ec3m c\u1ed1t l\u00f5i c\u1ee7a m\u1ed9t tam gi\u00e1c n\u1eb1m \u1edf t\u00ednh \u0111\u1ecbnh h\u01b0\u1edbng kh\u00f4ng th\u1ec3 \u0111\u1ea3o ng\u01b0\u1ee3c c\u1ee7a n\u00f3. Cho d\u00f9 l\u00e0 tam gi\u00e1c \u0111\u1ec1u, tam gi\u00e1c c\u00e2n hay tam gi\u00e1c th\u01b0\u1eddng, tr\u1ecdng t\u00e2m v\u00e0 c\u00e1c l\u1ef1c t\u00e1c d\u1ee5ng l\u00ean n\u00f3 \u0111\u1ec1u h\u01b0\u1edbng v\u1ec1 m\u1ed9t h\u01b0\u1edbng nh\u1ea5t \u0111\u1ecbnh. \u0110\u1eb7c bi\u1ec7t khi c\u00e1c g\u00f3c nh\u1ecdn \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh r\u00f5 r\u00e0ng, m\u1ed9t tam gi\u00e1c c\u00f3 th\u1ec3 g\u1ee3i l\u00ean c\u1ea3m gi\u00e1c &quot;h\u01b0\u1edbng l\u00ean&quot;, &quot;v\u01b0\u01a1n l\u00ean&quot; ho\u1eb7c &quot;r\u01a1i xu\u1ed1ng&quot;. T\u00ednh \u0111\u1ecbnh h\u01b0\u1edbng n\u00e0y th\u01b0\u1eddng li\u00ean k\u1ebft tam gi\u00e1c m\u1ed9t c\u00e1ch t\u01b0\u1ee3ng tr\u01b0ng v\u1edbi s\u1ef1 chuy\u1ec3n \u0111\u1ed9ng, thay \u0111\u1ed5i, d\u1eabn d\u1eaft v\u00e0 quy\u1ec1n l\u1ef1c, nh\u01b0ng nh\u1eefng bi\u1ec3u t\u01b0\u1ee3ng n\u00e0y kh\u00f4ng b\u1eaft ngu\u1ed3n t\u1eeb c\u00e1c li\u00ean t\u01b0\u1edfng th\u1ecb gi\u00e1c; m\u00e0 \u0111\u00fang h\u01a1n, ch\u00fang xu\u1ea5t ph\u00e1t t\u1eeb s\u1ef1 c\u0103ng th\u1eb3ng v\u1ec1 c\u1ea5u tr\u00fac c\u1ee7a n\u00f3.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"600\" height=\"600\" src=\"https:\/\/arttao.net\/wp-content\/uploads\/2026\/02\/Pokebowl-Sticker-by-Poke-Theory.gif\" alt=\"\" class=\"wp-image-986\" style=\"width:60px;height:auto\"\/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">H\u00ecnh tam gi\u00e1c c\u0169ng l\u00e0 \u0111\u01a1n v\u1ecb c\u1ea5u tr\u00fac \u1ed5n \u0111\u1ecbnh nh\u1ecf nh\u1ea5t. Trong k\u1ef9 thu\u1eadt v\u00e0 k\u1ef9 thu\u1eadt k\u1ebft c\u1ea5u, h\u00ecnh tam gi\u00e1c \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng r\u1ed9ng r\u00e3i \u0111\u1ec3 x\u00e2y d\u1ef1ng c\u00e1c khung ch\u1eafc ch\u1eafn ch\u00ednh v\u00ec ba c\u1ea1nh c\u1ee7a n\u00f3 h\u1ed7 tr\u1ee3 l\u1eabn nhau v\u00e0 kh\u00f4ng th\u1ec3 bi\u1ebfn d\u1ea1ng m\u00e0 kh\u00f4ng l\u00e0m thay \u0111\u1ed5i \u0111\u1ed9 d\u00e0i c\u1ea1nh. \u0110\u1eb7c \u0111i\u1ec3m n\u00e0y mang l\u1ea1i cho h\u00ecnh tam gi\u00e1c m\u1ed9t t\u00ednh hai m\u1eb7t m\u00e2u thu\u1eabn \u1edf c\u1ea5p \u0111\u1ed9 bi\u1ec3u t\u01b0\u1ee3ng: m\u1ed9t m\u1eb7t, n\u00f3 th\u1ec3 hi\u1ec7n c\u1ea3m gi\u00e1c b\u1ea5t \u1ed5n v\u00e0 n\u0103ng \u0111\u1ed9ng v\u1ec1 m\u1eb7t th\u1ecb gi\u00e1c; m\u1eb7t kh\u00e1c, n\u00f3 l\u1ea1i c\u1ef1c k\u1ef3 v\u1eefng ch\u1eafc v\u1ec1 m\u1eb7t c\u1ea5u tr\u00fac. S\u1ef1 c\u0103ng th\u1eb3ng n\u00e0y l\u00e0m cho h\u00ecnh tam gi\u00e1c tr\u1edf th\u00e0nh m\u1ed9t bi\u1ec3u t\u01b0\u1ee3ng quan tr\u1ecdng \u0111\u1ec3 th\u1ec3 hi\u1ec7n &quot;s\u1ef1 \u1ed5n \u0111\u1ecbnh trong chuy\u1ec3n \u0111\u1ed9ng&quot; ho\u1eb7c &quot;tr\u1eadt t\u1ef1 trong thay \u0111\u1ed5i&quot;.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Trong b\u1ed1i c\u1ea3nh tr\u1eebu t\u01b0\u1ee3ng h\u00ecnh h\u1ecdc, h\u00ecnh tam gi\u00e1c th\u01b0\u1eddng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 th\u1ec3 hi\u1ec7n s\u1ef1 xung \u0111\u1ed9t v\u1ec1 c\u1ea5u tr\u00fac. So v\u1edbi s\u1ef1 c\u00e2n b\u1eb1ng c\u1ee7a h\u00ecnh vu\u00f4ng, h\u00ecnh tam gi\u00e1c ph\u00e1 v\u1ee1 tr\u1ea1ng th\u00e1i c\u00e2n b\u1eb1ng c\u1ee7a b\u1ed1 c\u1ee5c, g\u00e2y ra s\u1ef1 thay \u0111\u1ed5i h\u01b0\u1edbng trong h\u1ec7 th\u1ed1ng. S\u1ef1 hi\u1ec7n di\u1ec7n c\u1ee7a n\u00f3 th\u01b0\u1eddng bi\u1ec3u th\u1ecb r\u1eb1ng c\u1ea5u tr\u00fac kh\u00f4ng c\u00f2n kh\u00e9p k\u00edn n\u1eefa, m\u00e0 \u0111ang trong tr\u1ea1ng th\u00e1i h\u00ecnh th\u00e0nh ho\u1eb7c chuy\u1ec3n \u0111\u1ed5i. Do \u0111\u00f3, \u1edf c\u1ea5p \u0111\u1ed9 bi\u1ec3u t\u01b0\u1ee3ng, h\u00ecnh tam gi\u00e1c th\u01b0\u1eddng \u0111\u01b0\u1ee3c li\u00ean k\u1ebft v\u1edbi c\u00e1c quy\u1ebft \u0111\u1ecbnh, s\u1ef1 chuy\u1ec3n \u0111\u1ed5i ho\u1eb7c c\u00e1c tr\u1ea1ng th\u00e1i quan tr\u1ecdng, h\u01a1n l\u00e0 s\u1ef1 ho\u00e0n thi\u1ec7n cu\u1ed1i c\u00f9ng.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"600\" height=\"600\" src=\"https:\/\/arttao.net\/wp-content\/uploads\/2026\/02\/Pokebowl-Sticker-by-Poke-Theory.gif\" alt=\"\" class=\"wp-image-986\" style=\"width:61px;height:auto\"\/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">H\u00ecnh tam gi\u00e1c c\u0169ng s\u1edf h\u1eefu kh\u1ea3 n\u0103ng g\u1ee3i \u00fd v\u1ec1 th\u1ee9 b\u1eadc \u0111\u00e1ng k\u1ec3. Ba g\u00f3c c\u1ee7a n\u00f3 th\u1ec3 hi\u1ec7n c\u00e1c m\u1ed1i quan h\u1ec7 kh\u00e1c nhau m\u1ed9t c\u00e1ch t\u1ef1 nhi\u00ean, \u0111\u1eb7c bi\u1ec7t l\u00e0 trong c\u00e1c tam gi\u00e1c kh\u00f4ng \u0111\u1ec1u, n\u01a1i th\u1ee9 b\u1eadc \u0111\u01b0\u1ee3c th\u1ec3 hi\u1ec7n r\u1ea5t r\u00f5 r\u1ec7t. S\u1ef1 b\u1ea5t b\u00ecnh \u0111\u1eb3ng b\u00ean trong n\u00e0y khi\u1ebfn h\u00ecnh tam gi\u00e1c th\u01b0\u1eddng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng m\u1ed9t c\u00e1ch t\u01b0\u1ee3ng tr\u01b0ng \u0111\u1ec3 th\u1ec3 hi\u1ec7n s\u1ef1 c\u0103ng th\u1eb3ng, ph\u00e2n b\u1ed5 quy\u1ec1n l\u1ef1c ho\u1eb7c \u0111\u1ecbnh h\u01b0\u1edbng c\u1ea5u tr\u00fac. Kh\u00f4ng gi\u1ed1ng nh\u01b0 b\u1ea3n ch\u1ea5t phi th\u1ee9 b\u1eadc c\u1ee7a h\u00ecnh tr\u00f2n, h\u00ecnh tam gi\u00e1c g\u1ea7n gi\u1ed1ng v\u1edbi &quot;\u0111\u01a1n v\u1ecb vect\u01a1&quot; h\u01a1n v\u1ec1 c\u1ea5u tr\u00fac, nh\u1ea5n m\u1ea1nh s\u1ef1 thay \u0111\u1ed5i v\u1ec1 h\u01b0\u1edbng v\u00e0 m\u1ed1i quan h\u1ec7.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u0110i\u1ec1u \u0111\u00e1ng ch\u00fa \u00fd l\u00e0 \u00fd ngh\u0129a bi\u1ec3u t\u01b0\u1ee3ng c\u1ee7a h\u00ecnh tam gi\u00e1c ph\u1ee5 thu\u1ed9c r\u1ea5t nhi\u1ec1u v\u00e0o h\u01b0\u1edbng v\u00e0 c\u00e1ch s\u1eafp x\u1ebfp c\u1ee7a n\u00f3. Khi \u0111\u1ec9nh h\u01b0\u1edbng l\u00ean tr\u00ean, n\u00f3 nh\u1ea5n m\u1ea1nh c\u1ea3m gi\u00e1c th\u0103ng ti\u1ebfn v\u00e0 t\u1eadp trung; khi \u0111\u1ec9nh h\u01b0\u1edbng xu\u1ed1ng d\u01b0\u1edbi, n\u00f3 mang l\u1ea1i c\u1ea3m gi\u00e1c b\u1ea5t \u1ed5n v\u00e0 suy tho\u00e1i. Khi nhi\u1ec1u h\u00ecnh tam gi\u00e1c \u0111\u01b0\u1ee3c l\u1eb7p l\u1ea1i, xoay ho\u1eb7c \u0111\u1eb7t c\u1ea1nh nhau, hi\u1ec7u \u1ee9ng bi\u1ec3u t\u01b0\u1ee3ng c\u1ee7a ch\u00fang thay \u0111\u1ed5i \u0111\u00e1ng k\u1ec3, th\u1eadm ch\u00ed c\u00f3 xu h\u01b0\u1edbng trung l\u1eadp. \u0110i\u1ec1u n\u00e0y cho th\u1ea5y \u00fd ngh\u0129a bi\u1ec3u t\u01b0\u1ee3ng c\u1ee7a h\u00ecnh tam gi\u00e1c kh\u00f4ng ph\u1ea3i l\u00e0 v\u1ed1n c\u00f3, m\u00e0 l\u00e0 k\u1ebft qu\u1ea3 c\u1ee7a c\u00e1c m\u1ed1i quan h\u1ec7.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Do \u0111\u00f3, trong h\u1ec7 th\u1ed1ng k\u00fd hi\u1ec7u h\u00ecnh h\u1ecdc c\u01a1 b\u1ea3n, h\u00ecnh tam gi\u00e1c kh\u00f4ng ch\u1ec9 t\u01b0\u1ee3ng tr\u01b0ng cho m\u1ed9t kh\u00e1i ni\u1ec7m \u0111\u01a1n l\u1ebb, m\u00e0 l\u00e0 m\u1ed9t bi\u1ec3u t\u01b0\u1ee3ng c\u00f3 c\u1ea5u tr\u00fac ph\u1ee9c t\u1ea1p th\u1ec3 hi\u1ec7n s\u1ef1 c\u0103ng th\u1eb3ng. Th\u00f4ng qua hai thu\u1ed9c t\u00ednh l\u00e0 t\u00ednh \u0111\u1ecbnh h\u01b0\u1edbng, t\u00ednh b\u1ea5t \u0111\u1ed1i x\u1ee9ng v\u00e0 c\u1ea5u tr\u00fac \u1ed5n \u0111\u1ecbnh t\u1ed1i thi\u1ec3u, n\u00f3 mang \u00fd ngh\u0129a v\u1ec1 s\u1ef1 thay \u0111\u1ed5i, s\u1ee9c m\u1ea1nh v\u00e0 s\u1ef1 chuy\u1ec3n \u0111\u1ed5i c\u1ea5u tr\u00fac. Trong h\u1ec7 th\u1ed1ng tr\u1eebu t\u01b0\u1ee3ng h\u00ecnh h\u1ecdc v\u00e0 ng\u00f4n ng\u1eef th\u1ecb gi\u00e1c, h\u00ecnh tam gi\u00e1c ch\u00ednh l\u00e0 \u0111\u01a1n v\u1ecb h\u00ecnh h\u1ecdc then ch\u1ed1t mang \u0111\u1ebfn t\u00ednh n\u0103ng \u0111\u1ed9ng, xung \u0111\u1ed9t v\u00e0 kh\u1ea3 n\u0103ng h\u00ecnh th\u00e0nh.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"500\" height=\"500\" src=\"https:\/\/arttao.net\/wp-content\/uploads\/2026\/02\/art11.gif\" alt=\"\" class=\"wp-image-1011\" style=\"width:64px;height:auto\"\/><\/figure>\n\n\n<p>\r\n        <div class=\"arttao-tts-wrap\" data-selector=\".entry-content p, .entry-content li, .arttao-tts-source-content p\" style=\"margin:12px 0;\">\r\n          <audio id=\"arttao-tts-audio\" controls preload=\"none\" style=\"width:100%; max-width:800px;\"><\/audio>\r\n          <div id=\"arttao-tts-status\" style=\"font-size:13px; margin-top:6px; color:#F7FFFF;\"><\/div>\r\n        <\/div>\r\n        <details class=\"arttao-tts-accordion\" style=\"margin: 20px 0;\">\r\n            <summary>B\u00e0i h\u1ecdc B2-3: Ph\u00e2n t\u00edch k\u00fd hi\u1ec7u c\u00e1c h\u00ecnh h\u1ecdc c\u01a1 b\u1ea3n - Tam gi\u00e1c (Nh\u1ea5p chu\u1ed9t \u0111\u1ec3 xem v\u00e0 nghe b\u00e0i \u0111\u1ecdc)<\/summary>\r\n            <div class=\"arttao-tts-source-content\">\r\n                <p>\nTrong h\u1ec7 th\u1ed1ng k\u00fd hi\u1ec7u h\u00ecnh h\u1ecdc c\u01a1 b\u1ea3n, h\u00ecnh tam gi\u00e1c l\u00e0 m\u1ed9t trong nh\u1eefng h\u00ecnh d\u1ea1ng n\u0103ng \u0111\u1ed9ng v\u00e0 c\u00f3 t\u00ednh \u0111\u1ecbnh h\u01b0\u1edbng cao nh\u1ea5t. Kh\u00f4ng gi\u1ed1ng nh\u01b0 s\u1ef1 kh\u00e9p k\u00edn li\u00ean t\u1ee5c c\u1ee7a h\u00ecnh tr\u00f2n v\u00e0 s\u1ef1 c\u00e2n b\u1eb1ng \u1ed5n \u0111\u1ecbnh c\u1ee7a h\u00ecnh vu\u00f4ng, h\u00ecnh tam gi\u00e1c v\u1ed1n d\u0129 ch\u1ee9a \u0111\u1ef1ng c\u00e1c y\u1ebfu t\u1ed1 kh\u00f4ng \u1ed5n \u0111\u1ecbnh trong c\u1ea5u tr\u00fac c\u1ee7a n\u00f3, v\u00e0 \u00fd ngh\u0129a bi\u1ec3u t\u01b0\u1ee3ng c\u1ee7a n\u00f3 b\u1eaft ngu\u1ed3n t\u1eeb \u0111\u1eb7c \u0111i\u1ec3m c\u1ea5u tr\u00fac n\u00e0y. Ba c\u1ea1nh v\u00e0 ba g\u00f3c t\u1ea1o th\u00e0nh m\u1ed9t \u0111a gi\u00e1c kh\u00e9p k\u00edn t\u1ed1i thi\u1ec3u, mang l\u1ea1i cho h\u00ecnh tam gi\u00e1c c\u1ea3 t\u00ednh to\u00e0n v\u1eb9n v\u00e0 kh\u1ea3 n\u0103ng kh\u00f4ng th\u1ec3 \u0111\u1ea1t \u0111\u01b0\u1ee3c tr\u1ea1ng th\u00e1i t\u0129nh ho\u00e0n to\u00e0n. V\u1ec1 m\u1eb7t h\u00ecnh h\u1ecdc, \u0111\u1eb7c \u0111i\u1ec3m c\u1ed1t l\u00f5i c\u1ee7a h\u00ecnh tam gi\u00e1c n\u1eb1m \u1edf t\u00ednh \u0111\u1ecbnh h\u01b0\u1edbng kh\u00f4ng th\u1ec3 \u0111\u1ea3o ng\u01b0\u1ee3c c\u1ee7a n\u00f3. Cho d\u00f9 l\u00e0 tam gi\u00e1c \u0111\u1ec1u, tam gi\u00e1c c\u00e2n hay tam gi\u00e1c th\u01b0\u1eddng, tr\u1ecdng t\u00e2m c\u1ee7a n\u00f3 v\u00e0 c\u00e1c l\u1ef1c t\u00e1c d\u1ee5ng l\u00ean n\u00f3 \u0111\u1ec1u h\u01b0\u1edbng v\u1ec1 m\u1ed9t h\u01b0\u1edbng nh\u1ea5t \u0111\u1ecbnh. \u0110\u1eb7c bi\u1ec7t khi c\u00e1c g\u00f3c nh\u1ecdn \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh r\u00f5 r\u00e0ng, h\u00ecnh tam gi\u00e1c g\u1ee3i l\u00ean c\u1ea3m gi\u00e1c &quot;h\u01b0\u1edbng l\u00ean&quot;, &quot;\u0111ang l\u00ean&quot; ho\u1eb7c &quot;\u0111ang xu\u1ed1ng&quot;. T\u00ednh \u0111\u1ecbnh h\u01b0\u1edbng n\u00e0y th\u01b0\u1eddng li\u00ean k\u1ebft h\u00ecnh tam gi\u00e1c m\u1ed9t c\u00e1ch t\u01b0\u1ee3ng tr\u01b0ng v\u1edbi chuy\u1ec3n \u0111\u1ed9ng, thay \u0111\u1ed5i, h\u01b0\u1edbng d\u1eabn v\u00e0 l\u1ef1c, nh\u01b0ng nh\u1eefng bi\u1ec3u t\u01b0\u1ee3ng n\u00e0y kh\u00f4ng b\u1eaft ngu\u1ed3n t\u1eeb c\u00e1c li\u00ean t\u01b0\u1edfng th\u1ecb gi\u00e1c m\u00e0 t\u1eeb s\u1ef1 c\u0103ng th\u1eb3ng c\u1ea5u tr\u00fac c\u1ee7a n\u00f3. H\u00ecnh tam gi\u00e1c c\u0169ng l\u00e0 \u0111\u01a1n v\u1ecb c\u1ea5u tr\u00fac \u1ed5n \u0111\u1ecbnh nh\u1ecf nh\u1ea5t. Trong k\u1ef9 thu\u1eadt v\u00e0 k\u1ef9 thu\u1eadt k\u1ebft c\u1ea5u, h\u00ecnh tam gi\u00e1c \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng r\u1ed9ng r\u00e3i \u0111\u1ec3 x\u00e2y d\u1ef1ng c\u00e1c khung \u1ed5n \u0111\u1ecbnh ch\u00ednh x\u00e1c v\u00ec ba c\u1ea1nh h\u1ed7 tr\u1ee3 l\u1eabn nhau v\u00e0 kh\u00f4ng th\u1ec3 bi\u1ebfn d\u1ea1ng m\u00e0 kh\u00f4ng l\u00e0m thay \u0111\u1ed5i \u0111\u1ed9 d\u00e0i c\u1ea1nh c\u1ee7a ch\u00fang. \u0110\u1eb7c \u0111i\u1ec3m n\u00e0y khi\u1ebfn h\u00ecnh tam gi\u00e1c mang t\u00ednh hai m\u1eb7t m\u00e2u thu\u1eabn \u1edf c\u1ea5p \u0111\u1ed9 bi\u1ec3u t\u01b0\u1ee3ng: m\u1ed9t m\u1eb7t, n\u00f3 th\u1ec3 hi\u1ec7n s\u1ef1 b\u1ea5t \u1ed5n v\u00e0 n\u0103ng \u0111\u1ed9ng v\u1ec1 m\u1eb7t th\u1ecb gi\u00e1c; m\u1eb7t kh\u00e1c, n\u00f3 l\u1ea1i c\u1ef1c k\u1ef3 v\u1eefng ch\u1eafc v\u1ec1 m\u1eb7t c\u1ea5u tr\u00fac. S\u1ef1 c\u0103ng th\u1eb3ng n\u00e0y khi\u1ebfn h\u00ecnh tam gi\u00e1c tr\u1edf th\u00e0nh m\u1ed9t bi\u1ec3u t\u01b0\u1ee3ng quan tr\u1ecdng \u0111\u1ec3 th\u1ec3 hi\u1ec7n &quot;s\u1ef1 \u1ed5n \u0111\u1ecbnh trong n\u0103ng \u0111\u1ed9ng&quot; hay &quot;tr\u1eadt t\u1ef1 trong thay \u0111\u1ed5i&quot;. Trong b\u1ed1i c\u1ea3nh tr\u1eebu t\u01b0\u1ee3ng h\u00ecnh h\u1ecdc, h\u00ecnh tam gi\u00e1c th\u01b0\u1eddng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 th\u1ec3 hi\u1ec7n xung \u0111\u1ed9t c\u1ea5u tr\u00fac. So v\u1edbi s\u1ef1 c\u00e2n b\u1eb1ng c\u1ee7a h\u00ecnh vu\u00f4ng, h\u00ecnh tam gi\u00e1c ph\u00e1 v\u1ee1 s\u1ef1 c\u00e2n b\u1eb1ng c\u1ee7a h\u00ecnh \u1ea3nh, g\u00e2y ra s\u1ef1 d\u1ecbch chuy\u1ec3n h\u01b0\u1edbng trong h\u1ec7 th\u1ed1ng. S\u1ef1 t\u1ed3n t\u1ea1i c\u1ee7a n\u00f3 th\u01b0\u1eddng bi\u1ec3u th\u1ecb r\u1eb1ng c\u1ea5u tr\u00fac kh\u00f4ng c\u00f2n kh\u00e9p k\u00edn m\u00e0 \u0111ang trong qu\u00e1 tr\u00ecnh h\u00ecnh th\u00e0nh ho\u1eb7c chuy\u1ec3n \u0111\u1ed5i. Do \u0111\u00f3, \u1edf c\u1ea5p \u0111\u1ed9 bi\u1ec3u t\u01b0\u1ee3ng, h\u00ecnh tam gi\u00e1c th\u01b0\u1eddng \u0111\u01b0\u1ee3c li\u00ean k\u1ebft v\u1edbi vi\u1ec7c ra quy\u1ebft \u0111\u1ecbnh, chuy\u1ec3n \u0111\u1ed5i ho\u1eb7c c\u00e1c tr\u1ea1ng th\u00e1i quan tr\u1ecdng, h\u01a1n l\u00e0 s\u1ef1 ho\u00e0n thi\u1ec7n cu\u1ed1i c\u00f9ng. H\u00ecnh tam gi\u00e1c c\u0169ng c\u00f3 kh\u1ea3 n\u0103ng \u0111\u00e1ng k\u1ec3 trong vi\u1ec7c g\u1ee3i \u00fd th\u1ee9 b\u1eadc. Ba g\u00f3c t\u1ef1 nhi\u00ean t\u1ea1o th\u00e0nh c\u00e1c m\u1ed1i quan h\u1ec7 kh\u00e1c nhau, \u0111\u1eb7c bi\u1ec7t l\u00e0 trong c\u00e1c tam gi\u00e1c kh\u00f4ng \u0111\u1ec1u, n\u01a1i c\u00e1c m\u1ed1i quan h\u1ec7 ch\u00ednh v\u00e0 ph\u1ee5 c\u1ef1c k\u1ef3 r\u00f5 r\u00e0ng. S\u1ef1 b\u1ea5t b\u00ecnh \u0111\u1eb3ng n\u1ed9i t\u1ea1i n\u00e0y khi\u1ebfn h\u00ecnh tam gi\u00e1c th\u01b0\u1eddng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng m\u1ed9t c\u00e1ch t\u01b0\u1ee3ng tr\u01b0ng \u0111\u1ec3 th\u1ec3 hi\u1ec7n s\u1ef1 c\u0103ng th\u1eb3ng, s\u1ef1 ph\u00e2n b\u1ed5 quy\u1ec1n l\u1ef1c ho\u1eb7c \u0111\u1ecbnh h\u01b0\u1edbng c\u1ea5u tr\u00fac. Kh\u00f4ng gi\u1ed1ng nh\u01b0 t\u00ednh ch\u1ea5t phi th\u1ee9 b\u1eadc c\u1ee7a h\u00ecnh tr\u00f2n, h\u00ecnh tam gi\u00e1c g\u1ea7n gi\u1ed1ng v\u1edbi m\u1ed9t &quot;\u0111\u01a1n v\u1ecb vect\u01a1&quot; h\u01a1n v\u1ec1 c\u1ea5u tr\u00fac, nh\u1ea5n m\u1ea1nh s\u1ef1 thay \u0111\u1ed5i v\u1ec1 h\u01b0\u1edbng v\u00e0 c\u00e1c m\u1ed1i quan h\u1ec7. \u0110i\u1ec1u \u0111\u00e1ng ch\u00fa \u00fd l\u00e0 \u00fd ngh\u0129a bi\u1ec3u t\u01b0\u1ee3ng c\u1ee7a h\u00ecnh tam gi\u00e1c ph\u1ee5 thu\u1ed9c r\u1ea5t nhi\u1ec1u v\u00e0o h\u01b0\u1edbng v\u00e0 s\u1ef1 k\u1ebft h\u1ee3p c\u1ee7a n\u00f3. Khi c\u00e1c g\u00f3c nh\u1ecdn h\u01b0\u1edbng l\u00ean tr\u00ean, ch\u00fang l\u00e0m n\u1ed5i b\u1eadt c\u1ea3m gi\u00e1c th\u0103ng ti\u1ebfn v\u00e0 t\u1eadp trung; khi ch\u00fang h\u01b0\u1edbng xu\u1ed1ng d\u01b0\u1edbi, ch\u00fang t\u1ea1o ra c\u1ea3m gi\u00e1c b\u1ea5t \u1ed5n v\u00e0 \u0111i xu\u1ed1ng. Khi nhi\u1ec1u h\u00ecnh tam gi\u00e1c \u0111\u01b0\u1ee3c l\u1eb7p l\u1ea1i, xoay ho\u1eb7c \u0111\u1eb7t c\u1ea1nh nhau, hi\u1ec7u \u1ee9ng bi\u1ec3u t\u01b0\u1ee3ng c\u1ee7a ch\u00fang thay \u0111\u1ed5i \u0111\u00e1ng k\u1ec3, th\u1eadm ch\u00ed c\u00f3 xu h\u01b0\u1edbng trung t\u00ednh. \u0110i\u1ec1u n\u00e0y cho th\u1ea5y \u00fd ngh\u0129a bi\u1ec3u t\u01b0\u1ee3ng c\u1ee7a h\u00ecnh tam gi\u00e1c kh\u00f4ng ph\u1ea3i l\u00e0 v\u1ed1n c\u00f3, m\u00e0 l\u00e0 k\u1ebft qu\u1ea3 c\u1ee7a c\u00e1c m\u1ed1i quan h\u1ec7. Do \u0111\u00f3, trong h\u1ec7 th\u1ed1ng k\u00fd hi\u1ec7u h\u00ecnh h\u1ecdc c\u01a1 b\u1ea3n, h\u00ecnh tam gi\u00e1c kh\u00f4ng t\u01b0\u1ee3ng tr\u01b0ng cho m\u1ed9t kh\u00e1i ni\u1ec7m duy nh\u1ea5t, m\u00e0 l\u00e0 m\u1ed9t bi\u1ec3u t\u01b0\u1ee3ng c\u00f3 c\u1ea5u tr\u00fac cao v\u1ec1 s\u1ef1 c\u0103ng th\u1eb3ng. Th\u00f4ng qua hai thu\u1ed9c t\u00ednh l\u00e0 t\u00ednh \u0111\u1ecbnh h\u01b0\u1edbng, t\u00ednh b\u1ea5t \u0111\u1ed1i x\u1ee9ng v\u00e0 c\u1ea5u tr\u00fac \u1ed5n \u0111\u1ecbnh t\u1ed1i thi\u1ec3u, n\u00f3 mang \u00fd ngh\u0129a v\u1ec1 s\u1ef1 thay \u0111\u1ed5i, s\u1ee9c m\u1ea1nh v\u00e0 s\u1ef1 chuy\u1ec3n \u0111\u1ed5i c\u1ea5u tr\u00fac. Trong h\u1ec7 th\u1ed1ng tr\u1eebu t\u01b0\u1ee3ng h\u00ecnh h\u1ecdc v\u00e0 ng\u00f4n ng\u1eef th\u1ecb gi\u00e1c, h\u00ecnh tam gi\u00e1c ch\u00ednh x\u00e1c l\u00e0 \u0111\u01a1n v\u1ecb h\u00ecnh h\u1ecdc then ch\u1ed1t t\u1ea1o ra t\u00ednh n\u0103ng \u0111\u1ed9ng, xung \u0111\u1ed9t v\u00e0 kh\u1ea3 n\u0103ng h\u00ecnh th\u00e0nh.<\/p>\n\r\n            <\/div>\r\n        <\/details><\/p>","protected":false},"excerpt":{"rendered":"<p>3\u3001\u4e09\u89d2\u5f62 \u5728\u57fa\u672c\u51e0\u4f55\u7b26\u53f7\u4f53\u7cfb\u4e2d\uff0c\u4e09\u89d2\u5f62\u662f\u6700\u5177\u5f20\u529b\u4e0e\u65b9\u5411\u6027\u7684\u5f62\u6001\u4e4b\u4e00\u3002\u4e0e\u5706\u5f62\u7684\u8fde\u7eed\u5c01\u95ed\u3001\u6b63\u65b9\u5f62\u7684\u7a33\u5b9a\u5747\u8861\u4e0d\u540c\uff0c [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_crdt_document":"","footnotes":""},"class_list":["post-984","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/arttao.net\/vi\/wp-json\/wp\/v2\/pages\/984","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/arttao.net\/vi\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/arttao.net\/vi\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/arttao.net\/vi\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/arttao.net\/vi\/wp-json\/wp\/v2\/comments?post=984"}],"version-history":[{"count":3,"href":"https:\/\/arttao.net\/vi\/wp-json\/wp\/v2\/pages\/984\/revisions"}],"predecessor-version":[{"id":1012,"href":"https:\/\/arttao.net\/vi\/wp-json\/wp\/v2\/pages\/984\/revisions\/1012"}],"wp:attachment":[{"href":"https:\/\/arttao.net\/vi\/wp-json\/wp\/v2\/media?parent=984"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}