{"id":2555,"date":"2021-10-14T21:04:46","date_gmt":"2021-10-14T14:04:46","guid":{"rendered":"https:\/\/www.vietlearn.org\/post\/?p=2555"},"modified":"2022-02-16T18:50:32","modified_gmt":"2022-02-16T11:50:32","slug":"tong-ba-goc-cua-mot-tam-giac-toan-lop-7-la-chuyen-nho","status":"publish","type":"post","link":"https:\/\/www.vietlearn.org\/kien-thuc\/tong-ba-goc-cua-mot-tam-giac-toan-lop-7-la-chuyen-nho\/","title":{"rendered":"T\u1ed5ng ba g\u00f3c c\u1ee7a m\u1ed9t tam gi\u00e1c \u2013 To\u00e1n l\u1edbp 7 l\u00e0 chuy\u1ec7n nh\u1ecf"},"content":{"rendered":"\n<p>Ghi ch\u00fa: T\u00e0i li\u1ec7u tr\u00edch d\u1eabn<\/p>\n\n\n\n<p>S\u1ed1 \u0111o c\u00e1c g\u00f3c trong 1 tam gi\u00e1c c\u00f3 m\u1ed1i li\u00ean h\u1ec7 g\u00ec v\u1edbi nhau? T\u1eeb l\u00e2u, c\u00e1c nh\u00e0 to\u00e1n h\u1ecdc \u0111\u00e3 nh\u1eadn th\u1ea5y gi\u1eefa c\u00e1c g\u00f3c trong tam gi\u00e1c c\u00f3 s\u1ef1 li\u00ean h\u1ec7 ch\u1eb7t ch\u1ebd. H\u00e3y c\u00f9ng theo d\u00f5i b\u00e0i vi\u1ebft sau \u0111\u1ec3 t\u00ecm hi\u1ec3u v\u1ec1 m\u1ed1i l\u00ean h\u1ec7 gi\u1eefa t\u1ed5ng ba g\u00f3c c\u1ee7a m\u1ed9t tam gi\u00e1c.<\/p>\n\n\n\n<ol class=\"wp-block-list\"><li>\u0110\u1ecbnh l\u00fd v\u1ec1 t\u1ed5ng ba g\u00f3c c\u1ee7a m\u1ed9t tam gi\u00e1c<\/li><\/ol>\n\n\n\n<p>Th\u1eadt v\u1eady, qua nhi\u1ec1u ph\u01b0\u01a1ng ph\u00e1p ch\u1ee9ng minh v\u00e0 b\u1eb1ng c\u1ea3 th\u1ef1c nghi\u1ec7m c\u00e1c nh\u00e0 to\u00e1n h\u1ecdc c\u00f4ng nh\u1eadn r\u1eb1ng t\u1ed5ng s\u1ed1 \u0111o c\u00e1c g\u00f3c trong 1 tam gi\u00e1c b\u1eb1ng 180\u2070. V\u00ec v\u1eady, ta th\u1eeba nh\u1eadn \u0111\u1ecbnh l\u00fd n\u00e0y v\u00e0 c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng m\u00e0 kh\u00f4ng c\u1ea7n ch\u00fang minh n\u00f3.<\/p>\n\n\n\n<p>V\u00ed d\u1ee5:<\/p>\n\n\n\n<p>V\u1ebd m\u1ed9t tam gi\u00e1c b\u1ea5t k\u1ef3<\/p>\n\n\n\n<p>S\u1eed d\u1ee5ng th\u01b0\u1edbc \u0111o \u0111\u1ed9 x\u00e1c \u0111\u1ecbnh s\u1ed1 \u0111o c\u1ee7a c\u00e1c g\u00f3c<\/p>\n\n\n\n<p>T\u00ednh t\u1ed5ng s\u1ed1 \u0111o c\u00e1c g\u00f3c c\u1ee7a tam gi\u00e1c \u0111\u00f3.<\/p>\n\n\n\n<p>=&gt; Ta nh\u1eadn th\u1ea5y t\u1ed5ng s\u1ed1 \u0111o c\u00e1c g\u00f3c c\u1ee7a tam gi\u00e1c b\u1eb1ng 180\u2070<\/p>\n\n\n\n<p>V\u00ed d\u1ee5 2:<\/p>\n\n\n\n<p>S\u1eed d\u1ee5ng 1 t\u1ea5m b\u00eca, c\u1eaft t\u1ea5m b\u00eca th\u00e0nh 1 h\u00ecnh tam gi\u00e1c b\u1ea5t k\u1ef3<\/p>\n\n\n\n<p>C\u1eaft 3 g\u00f3c c\u1ee7a tam gi\u00e1c \u0111\u00f3<\/p>\n\n\n\n<p>X\u1ebfp c\u00e1c g\u00f3c \u0111\u00e3 c\u1eaft l\u1ea1i v\u1edbi nhau sao cho c\u1ea1nh c\u1ee7a tam gi\u00e1c n\u00e0y s\u00e1t v\u1edbi c\u1ea1nh c\u1ee7a tam gi\u00e1c kia<\/p>\n\n\n\n<p>D\u1ef1 \u0111o\u00e1n g\u00f3c \u0111\u01b0\u1ee3c t\u1ea1o th\u00e0nh.<\/p>\n\n\n\n<p>=&gt; Ta nh\u1eadn th\u1ea5y 3 g\u00f3c c\u1ee7a tam gi\u00e1c x\u1ebfp th\u00e0nh 1 g\u00f3c b\u1eb9t<\/p>\n\n\n\n<p>V\u00ed d\u1ee5 3: Cho tam gi\u00e1c ABC, ch\u1ee9ng minh r\u1eb1ng t\u1ed5ng ba g\u00f3c c\u1ee7a n\u00f3 b\u1eb1ng 180\u2070<\/p>\n\n\n\n<p>L\u1eddi gi\u1ea3i:<\/p>\n\n\n\n<p>Qua \u0111\u1ec9nh A, k\u1ebb \u0111\u01b0\u1eddng th\u1eb3ng xy song song v\u1edbi BC.<\/p>\n\n\n\n<p>V\u00ec xy song song v\u1edbi BC n\u00ean g\u00f3c CAy = ACB<\/p>\n\n\n\n<p>T\u01b0\u01a1ng t\u1ef1, v\u00ec xy xong xong v\u1edbi BC n\u00ean g\u00f3c xAB = ABC<\/p>\n\n\n\n<p>Ta c\u00f3 xAy = 180\u2070<\/p>\n\n\n\n<p>m\u00e0 xAy = xAB + BAC + yAC = ABC + BAC + ACB = 180\u2070<\/p>\n\n\n\n<ol class=\"wp-block-list\" start=\"2\"><li>\u00c1p d\u1ee5ng v\u00e0o tam gi\u00e1c vu\u00f4ng<\/li><\/ol>\n\n\n\n<p>Ta c\u00f3: T\u1ed5ng ba g\u00f3c trong 1 tam gi\u00e1c c\u00f3 s\u1ed1 \u0111o b\u1eb1ng 180<\/p>\n\n\n\n<p>X\u00e9t trong tam gi\u00e1c vu\u00f4ng ABC vu\u00f4ng t\u1ea1i A, t\u1ed5ng c\u00e1c g\u00f3c l\u00e0:<\/p>\n\n\n\n<p>A + B + C = 180\u2070<\/p>\n\n\n\n<p>90 + B + C = 180\u2070<\/p>\n\n\n\n<p>=&gt; B + C = 180\u2070\u2013 90\u2070= 90\u2070<\/p>\n\n\n\n<p>Ta c\u00f3 \u0111\u1ecbnh l\u00fd sau:<\/p>\n\n\n\n<p>\u00c1p d\u1ee5ng trong tam gi\u00e1c vu\u00f4ng<\/p>\n\n\n\n<p>L\u00fd gi\u1ea3i: Ta c\u00f3 t\u1ed5ng ba g\u00f3c trong 1 tam gi\u00e1c b\u1eb1ng 180, trong khi \u0111\u00f3, tam gi\u00e1c vu\u00f4ng c\u00f3 1 g\u00f3c vu\u00f4ng b\u1eb1ng 90, do \u0111\u00f3, t\u1ed5ng s\u1ed1 \u0111o c\u00e1c g\u00f3c c\u00f2n l\u1ea1i (hai g\u00f3c nh\u1ecdn) b\u1eb1ng 180 \u2013 90 = 90<\/p>\n\n\n\n<p>=&gt; Hai g\u00f3c nh\u1ecdn trong tam gi\u00e1c vu\u00f4ng ph\u1ee5 nhau.<\/p>\n\n\n\n<ol class=\"wp-block-list\" start=\"3\"><li>G\u00f3c ngo\u00e0i c\u1ee7a tam gi\u00e1c<\/li><\/ol>\n\n\n\n<p>Th\u1ebf n\u00e0o l\u00e0 g\u00f3c ngo\u00e0i c\u1ee7a tam gi\u00e1c? G\u00f3c ngo\u00e0i c\u1ee7a tam gi\u00e1c c\u00f3 t\u00ednh ch\u1ea5t g\u00ec?<\/p>\n\n\n\n<p>Ta c\u00f3 \u0111\u1ecbnh ngh\u0129a:<\/p>\n\n\n\n<p>V\u00ed d\u1ee5:<\/p>\n\n\n\n<p>Cho tam gi\u00e1c ABC, qua C, k\u1ebb tia Cx l\u00e0 tia \u0111\u1ed1i c\u1ee7a tia BC.<\/p>\n\n\n\n<p>Ta \u0111\u01b0\u1ee3c g\u00f3c m\u1edbi ACx<\/p>\n\n\n\n<p>L\u1eddi gi\u1ea3i:<\/p>\n\n\n\n<p>Ta c\u00f3 t\u1ed5ng s\u1ed1 \u0111o c\u00e1c g\u00f3c trong ABC l\u00e0: BAC + ABC + ACB = 180\u2070<\/p>\n\n\n\n<p>BAC + ABC = 180\u2070 \u2013 ACB (1)<\/p>\n\n\n\n<p>L\u1ea1i c\u00f3 BCx = ACB + ACx = 180\u2070<\/p>\n\n\n\n<p>=&gt; ACx = 180\u2070\u2013 ACB (2)<\/p>\n\n\n\n<p>T\u1eeb (1) v\u00e0 (2), suy ra BAC + ABC = ACx<\/p>\n\n\n\n<p>Ta c\u00f3 \u0111\u1ecbnh l\u00fd sau:<\/p>\n\n\n\n<p>Nh\u1eadn x\u00e9t:<\/p>\n\n\n\n<ol class=\"wp-block-list\" start=\"4\"><li>M\u1eb9o ghi nh\u1edb t\u1ed5ng ba g\u00f3c c\u1ee7a m\u1ed9t tam gi\u00e1c<\/li><\/ol>\n\n\n\n<p>V\u1edbi 1 tam gi\u00e1c b\u1ea5t k\u1ef3, t\u1ed5ng s\u1ed1 \u0111o c\u00e1c g\u00f3c \u0111\u1ec1u b\u1eb1ng 180\u2070<\/p>\n\n\n\n<p>\u0110\u1ecbnh l\u00fd n\u00e0y \u0111\u00e3 \u0111\u01b0\u1ee3c th\u1eeba nh\u1eadn. Trong \u0111\u00f3 ta c\u00f3 c\u00f4ng th\u1ee9c t\u00ednh t\u1ed5ng s\u1ed1 \u0111o c\u00e1c g\u00f3c trong 1 \u0111a gi\u00e1c nh\u01b0 sau:<\/p>\n\n\n\n<p>T\u1ed5ng s\u1ed1 \u0111o = (n \u2013 2) . 180<\/p>\n\n\n\n<p>Trong \u0111\u00f3: n l\u00e0 s\u1ed1 c\u1ea1nh c\u1ee7a \u0111a gi\u00e1c.<\/p>\n\n\n\n<p>V\u00ed d\u1ee5:<\/p>\n\n\n\n<p>V\u1edbi tam gi\u00e1c, ta c\u00f3:<\/p>\n\n\n\n<p>T\u1ed5ng s\u1ed1 \u0111o c\u00e1c g\u00f3c trong = (3 \u2013 2) . 180 = 180<\/p>\n\n\n\n<p>V\u1edbi t\u1ee9 gi\u00e1c, ta c\u00f3:<\/p>\n\n\n\n<p>T\u1ed5ng s\u1ed1 \u0111o c\u00e1c g\u00f3c trong = (4 \u2013 2) . 180 = 360<\/p>\n\n\n\n<p>Trong tam gi\u00e1c vu\u00f4ng, t\u1ed5ng s\u1ed1 \u0111o hai g\u00f3c ph\u1ee5 nhau b\u1eb1ng 90\u2070.<\/p>\n\n\n\n<p>\u00c1p d\u1ee5ng \u0111\u1ecbnh l\u00fd v\u1ec1 t\u1ed5ng ba g\u00f3c trong 1 tam gi\u00e1c v\u00e0o tam gi\u00e1c vu\u00f4ng, ta c\u00f3 tam gi\u00e1c vu\u00f4ng c\u00f3 1 g\u00f3c b\u1eb1ng 90, do \u0111\u00f3 t\u1ed5ng hai g\u00f3c c\u00f2n l\u1ea1i b\u1eb1ng 180 \u2013 90 = 90 \u0111\u1ed9. Do \u0111\u00f3, ta n\u00f3i hai g\u00f3c nh\u1ecdn c\u1ee7a tam gi\u00e1c ph\u1ee5 nhau.<\/p>\n\n\n\n<p>C\u00e1c g\u00f3c ngo\u00e0i c\u1ee7a tam gi\u00e1c b\u1eb1ng t\u1ed5ng s\u1ed1 \u0111o c\u1ee7a hai g\u00f3c kh\u00f4ng k\u1ec1 v\u1edbi n\u00f3<\/p>\n\n\n\n<p>V\u00ec g\u00f3c ngo\u00e0i c\u1ee7a tam gi\u00e1c v\u00e0 g\u00f3c trong k\u1ec1 v\u1edbi n\u00f3 c\u00f3 t\u1ed5ng b\u1eb1ng 180. M\u00e0 t\u1ed5ng ba g\u00f3c trong 1 tam gi\u00e1c b\u1eb1ng 180. Do \u0111\u00f3, s\u1ed1 \u0111o g\u00f3c ngo\u00e0i c\u1ee7a tam gi\u00e1c b\u1eb1ng t\u1ed5ng s\u1ed1 \u0111o c\u1ee7a hai g\u00f3c trong kh\u00f4ng k\u1ec1 v\u1edbi n\u00f3.<\/p>\n\n\n\n<p>G\u00f3c ngo\u00e0i c\u1ee7a tam gi\u00e1c lu\u00f4n c\u00f3 s\u1ed1 \u0111o l\u1edbn h\u01a1n m\u1ed7i g\u00f3c trong kh\u00f4ng k\u1ec1 v\u1edbi n\u00f3.<\/p>\n\n\n\n<p>Ta th\u1ea5y g\u00f3c ngo\u00e0i c\u1ee7a tam gi\u00e1c b\u1eb1ng t\u1ed5ng s\u1ed1 \u0111o c\u00e1c g\u00f3c trong kh\u00f4ng k\u1ec1 v\u1edbi n\u00f3, do v\u1eady, g\u00f3c ngo\u00e0i lu\u00f4n lu\u00f4n l\u1edbn h\u01a1n m\u1ed7i g\u00f3c trong<\/p>\n\n\n\n<ol class=\"wp-block-list\" start=\"5\"><li>B\u00e0i t\u1eadp v\u1eadn d\u1ee5ng<\/li><\/ol>\n\n\n\n<p>B\u00e0i t\u1eadp 1:<\/p>\n\n\n\n<p>X\u00e9t tam gi\u00e1c ABC, cho b\u1ea3ng s\u1ed1 \u0111o g\u00f3c sau, h\u00e3y ho\u00e0n thi\u1ec7n c\u00e1c g\u00f3c c\u00f2n thi\u1ebfu<\/p>\n\n\n\n<p>G\u00f3c A 30\u2070 20\u2070 ? 50\u2070 ? 5\u2070<\/p>\n\n\n\n<p>G\u00f3c B 60\u2070 ? 15\u2070 10\u2070 77\u2070 90\u2070<\/p>\n\n\n\n<p>G\u00f3c C 90\u2070 70\u2070 45\u2070 ? 67\u2070 ?<\/p>\n\n\n\n<p>T\u1ed5ng ? 180\u2070 180\u2070 ? 0\u2070 ?<\/p>\n\n\n\n<p>L\u1eddi gi\u1ea3i:<\/p>\n\n\n\n<p>\u00c1p d\u1ee5ng \u0111\u1ecbnh l\u00fd v\u1ec1 t\u1ed5ng s\u1ed1 \u0111o ba g\u00f3c c\u1ee7a m\u1ed9t tam gi\u00e1c ta c\u00f3 A + B + C = 180<\/p>\n\n\n\n<p>=&gt; A = 180 \u2013 B \u2013 C<\/p>\n\n\n\n<p>=&gt; B = 180 \u2013 A \u2013 C<\/p>\n\n\n\n<p>=&gt; C = 180 \u2013 A -B<\/p>\n\n\n\n<p>\u00c1p d\u1ee5ng ph\u01b0\u01a1ng ph\u00e1p tr\u00ean v\u00e0o \u0111\u1ec1 b\u00e0i ta c\u00f3 b\u1ea3ng sau:<\/p>\n\n\n\n<p>G\u00f3c A 30\u2070 20\u2070 120\u2070 50\u2070 36\u2070 5\u2070<\/p>\n\n\n\n<p>G\u00f3c B 60\u2070 90\u2070 15\u2070 10\u2070 77\u2070 90\u2070<\/p>\n\n\n\n<p>G\u00f3c C 90\u2070 70\u2070 45\u2070 120\u2070 67\u2070 85\u2070<\/p>\n\n\n\n<p>T\u1ed5ng 180 180\u2070 180\u2070 180\u2070 180\u2070 180\u2070<\/p>\n\n\n\n<p>B\u00e0i t\u1eadp 2:<\/p>\n\n\n\n<p>X\u00e9t tam gi\u00e1c ABC vu\u00f4ng t\u1ea1i A, cho b\u1ea3ng s\u1ed1 \u0111o g\u00f3c sau, ho\u00e0n thi\u1ec7n c\u00e1c g\u00f3c c\u00f2n thi\u1ebfu:<\/p>\n\n\n\n<p>G\u00f3c B 15\u2070 20\u2070 ? 45\u2070 ? ? ? ?<\/p>\n\n\n\n<p>G\u00f3c C ? ? 10\u2070 ? 75\u2070 60\u2070 47\u2070 52\u2070<\/p>\n\n\n\n<p>L\u1eddi gi\u1ea3i:<\/p>\n\n\n\n<p>\u00c1p d\u1ee5ng \u0111\u1ecbnh l\u00fd t\u1ed5ng ba g\u00f3c trong 1 tam gi\u00e1c v\u00e0 t\u1ed5ng hai g\u00f3c nh\u1ecdn trong 1 tam gi\u00e1c ta c\u00f3:<\/p>\n\n\n\n<p>A + B + C = 180<\/p>\n\n\n\n<p>B + C = A = 90<\/p>\n\n\n\n<p>=&gt; B = 90 \u2013 C<\/p>\n\n\n\n<p>=&gt; C = 90 -B<\/p>\n\n\n\n<p>\u00c1p d\u1ee5ng ph\u01b0\u01a1ng ph\u00e1p tr\u00ean v\u00e0o \u0111\u1ec1 b\u00e0i ta c\u00f3 b\u1ea3ng sau:<\/p>\n\n\n\n<p>G\u00f3c B 15\u2070 20\u2070 80\u2070 45\u2070 24\u2070 30\u2070 43\u2070 38\u2070<\/p>\n\n\n\n<p>G\u00f3c C 75\u2070 70\u2070 10\u2070 45\u2070 66\u2070 60\u2070 47\u2070 52\u2070<\/p>\n\n\n\n<p>B\u00e0i t\u1eadp 2:<\/p>\n\n\n\n<p>X\u00e9t tam gi\u00e1c ABC, ACx l\u00e0 g\u00f3c ngo\u00e0i li\u1ec1n k\u1ec1 c\u1ee7a g\u00f3c C, ho\u00e0n thi\u1ec7n b\u1ea3ng sau<\/p>\n\n\n\n<p>G\u00f3c A 17\u2070 23\u2070 ? 30\u2070 ? 40\u2070<\/p>\n\n\n\n<p>G\u00f3c B 57\u2070 ? 45\u2070 50\u2070 10\u2070 ?<\/p>\n\n\n\n<p>G\u00f3c ACx ? 125\u2070 90\u2070 ? 105\u2070 150\u2070<\/p>\n\n\n\n<p>L\u1eddi gi\u1ea3i:<\/p>\n\n\n\n<p>\u00c1p d\u1ee5ng \u0111\u1ecbnh l\u00fd t\u1ed5ng s\u1ed1 \u0111o ba g\u00f3c c\u1ee7a m\u1ed9t tam gi\u00e1c ta c\u00f3:<\/p>\n\n\n\n<p>A + B + C = 180<\/p>\n\n\n\n<p>\u00c1p d\u1ee5ng \u0111\u1ecbnh l\u00fd v\u1ec1 g\u00f3c ngo\u00e0i c\u1ee7a tam gi\u00e1c ta c\u00f3:<\/p>\n\n\n\n<p>ACx = A + B<\/p>\n\n\n\n<p>\u00c1p d\u1ee5ng c\u00e1c ph\u01b0\u01a1ng ph\u00e1p tr\u00ean v\u00e0o \u0111\u1ec1 b\u00e0i ta c\u00f3:<\/p>\n\n\n\n<p>G\u00f3c A 17\u2070 23\u2070 45\u2070 30\u2070 95\u2070 40\u2070<\/p>\n\n\n\n<p>G\u00f3c B 57\u2070 102\u2070 45\u2070 50\u2070 10\u2070 110\u2070<\/p>\n\n\n\n<p>G\u00f3c ACx 74\u2070 125\u2070 90\u2070 90\u2070 105\u2070 150\u2070<\/p>\n\n\n\n<p>L\u1eddi k\u1ebft: Hy v\u1ecdng v\u1edbi n\u1ed9i dung b\u00e0i vi\u1ebft tr\u00ean, Vietlearn \u0111\u00e3 gi\u00fap c\u00e1c b\u00e9 n\u1eafm \u0111\u01b0\u1ee3c <a href=\"https:\/\/www.vietlearn.org\" data-internallinksmanager029f6b8e52c=\"2\" title=\"Vietlearn\" rel=\"nofollow\">ki\u1ebfn th\u1ee9c c\u01a1 b\u1ea3n<\/a> v\u1ec1 n\u1ed9i dung v\u1ec1 t\u1ed5ng ba g\u00f3c c\u1ee7a m\u1ed9t tam gi\u00e1c. \u0110\u00e2y \u0111\u01b0\u1ee3c xem nh\u01b0 n\u1ed9i dung r\u1ea5t quan tr\u1ecdng \u0111\u1ed1i v\u1edbi h\u00ecnh h\u1ecdc l\u1edbp 7. V\u00ec v\u1eady h\u00e3y th\u01b0\u1eddng xuy\u00ean \u00f4n b\u00e0i c\u0169ng nh\u01b0 luy\u1ec7n t\u1eadp gi\u1ea3i b\u00e0i t\u1eadp \u0111\u1ec3 c\u1ee7ng c\u1ed1 v\u00e0 n\u1eafm ch\u1eafc ki\u1ebfn th\u1ee9c nh\u00e9. Th\u01b0\u1eddng xuy\u00ean theo d\u00f5i Vietlearn \u0111\u1ec3 c\u1eadp nh\u1eadt nh\u1eefng b\u00e0i h\u1ecdc h\u1eefu \u00edch, t\u1ef1 tin l\u00e0m ch\u1ee7 ch\u01b0\u01a1ng tr\u00ecnh m\u00f4n to\u00e1n l\u1edbp 7.<\/p>\n\n\n\n<p>V\u1ec1 Vietlearn<\/p>\n\n\n\n<p>H\u1ecdc tr\u1ef1c tuy\u1ebfn t\u1ea1i Vietlearn<\/p>\n\n\n\n<p>Vietlearn l\u00e0 c\u00f4ng ty Edtech v\u1ec1 gi\u00e1o d\u1ee5c tr\u1ef1c tuy\u1ebfn, cung c\u1ea5p tr\u1ea3i nghi\u1ec7m <a href=\"https:\/\/www.vietlearn.org\" data-internallinksmanager029f6b8e52c=\"2\" title=\"Vietlearn\" rel=\"nofollow\">h\u1ecdc t\u1eadp<\/a> c\u00e1 nh\u00e2n cho h\u00e0ng tr\u0103m ngh\u00ecn <a href=\"https:\/\/www.vietlearn.org\" data-internallinksmanager029f6b8e52c=\"2\" title=\"Vietlearn\" rel=\"nofollow\">h\u1ecdc sinh<\/a>, sinh vi\u00ean v\u00e0 nh\u00e0 tr\u01b0\u1eddng \u0111\u1ec3 gi\u1ea3i \u0111\u00e1p nh\u1eefng y\u00eau c\u1ea7u trong vi\u1ec7c <a href=\"https:\/\/www.vietlearn.org\" data-internallinksmanager029f6b8e52c=\"2\" title=\"Vietlearn\" rel=\"nofollow\">h\u1ecdc t\u1eadp<\/a> Anh ng\u1eef th\u00f4ng qua m\u1ea1ng l\u01b0\u1edbi c\u00e1c <a href=\"https:\/\/www.vietlearn.org\" data-internallinksmanager029f6b8e52c=\"2\" title=\"Vietlearn\" rel=\"nofollow\">chuy\u00ean gia<\/a> v\u00e0 <a href=\"https:\/\/www.vietlearn.org\" data-internallinksmanager029f6b8e52c=\"2\" title=\"Vietlearn\" rel=\"nofollow\">gi\u00e1o vi\u00ean<\/a> kh\u1eafp to\u00e0n c\u1ea7u m\u00e0 ch\u00fang t\u00f4i g\u1ecdi l\u00e0 c\u00e1c <a href=\"https:\/\/www.vietlearn.org\" data-internallinksmanager029f6b8e52c=\"2\" title=\"Vietlearn\" rel=\"nofollow\">gia s\u01b0<\/a> h\u1ecdc thu\u1eadt qu\u1ed1c t\u1ebf.<\/p>\n\n\n\n<p>Vietlearn mong mu\u1ed1n tr\u1edf th\u00e0nh h\u1ec7 th\u1ed1ng h\u1ecdc t\u1eadp th\u00edch \u1ee9ng s\u1eed d\u1ee5ng c\u00f4ng ngh\u1ec7 tr\u00ed tu\u1ec7 nh\u00e2n t\u1ea1o (AI) v\u00e0 d\u1eef li\u1ec7u l\u1edbn h\u00e0ng \u0111\u1ea7u \u0110\u00f4ng Nam \u00c1. S\u1ee9 m\u1ec7nh c\u1ee7a Vietlearn l\u00e0 truy\u1ec1n c\u1ea3m h\u1ee9ng, truy\u1ec1n l\u1eeda, v\u00e0 b\u1ed3i d\u01b0\u1ee1ng th\u1ebf h\u1ec7 tr\u1ebb. Vietlearn mong mu\u1ed1n t\u1ea1o ra s\u1ef1 thay \u0111\u1ed5i v\u1ec1 tr\u00ed tu\u1ec7, nh\u1eadn th\u1ee9c x\u00e3 h\u1ed9i truy\u1ec1n c\u1ea3m h\u1ee9ng, gi\u00fap c\u00e1c em ph\u00e1t huy h\u1ebft ti\u1ec1m n\u0103ng trong vi\u1ec7c h\u1ecdc c\u0169ng nh\u01b0 \u0111i\u1ec3m m\u1ea1nh c\u1ee7a m\u00ecnh.<\/p>\n\n\n\n<p>\u0110\u0103ng k\u00fd kh\u00f3a h\u1ecdc cho con ngay h\u00f4m nay!<\/p>\n\n\n\n<p><\/p>\n\n\n\n<p>\u0110\u1ea1i l\u01b0\u1ee3ng t\u1ec9 l\u1ec7 ngh\u1ecbch \u2013 To\u00e1n l\u1edbp 7 l\u00e0 chuy\u1ec7n nh\u1ecf<\/p>\n\n\n\n<p>M\u1eb7t ph\u1eb3ng t\u1ecda \u0111\u1ed9 \u2013 To\u00e1n l\u1edbp 7 l\u00e0 chuy\u1ec7n nh\u1ecf<\/p>\n\n\n\n<p>V\u1ec1 Vietlearn<\/p>\n\n\n\n<p>H\u1ecdc tr\u1ef1c tuy\u1ebfn t\u1ea1i Vietlearn<\/p>\n\n\n\n<p>Vietlearn l\u00e0 c\u00f4ng ty Edtech v\u1ec1 gi\u00e1o d\u1ee5c tr\u1ef1c tuy\u1ebfn, cung c\u1ea5p tr\u1ea3i nghi\u1ec7m h\u1ecdc t\u1eadp c\u00e1 nh\u00e2n cho h\u00e0ng tr\u0103m ngh\u00ecn h\u1ecdc sinh, sinh vi\u00ean v\u00e0 nh\u00e0 tr\u01b0\u1eddng \u0111\u1ec3 gi\u1ea3i \u0111\u00e1p nh\u1eefng y\u00eau c\u1ea7u trong vi\u1ec7c h\u1ecdc t\u1eadp Anh ng\u1eef th\u00f4ng qua m\u1ea1ng l\u01b0\u1edbi c\u00e1c chuy\u00ean gia v\u00e0 gi\u00e1o vi\u00ean kh\u1eafp to\u00e0n c\u1ea7u m\u00e0 ch\u00fang t\u00f4i g\u1ecdi l\u00e0 c\u00e1c gia s\u01b0 h\u1ecdc thu\u1eadt qu\u1ed1c t\u1ebf.<\/p>\n\n\n\n<p>Vietlearn mong mu\u1ed1n tr\u1edf th\u00e0nh h\u1ec7 th\u1ed1ng h\u1ecdc t\u1eadp th\u00edch \u1ee9ng s\u1eed d\u1ee5ng c\u00f4ng ngh\u1ec7 tr\u00ed tu\u1ec7 nh\u00e2n t\u1ea1o (AI) v\u00e0 d\u1eef li\u1ec7u l\u1edbn h\u00e0ng \u0111\u1ea7u \u0110\u00f4ng Nam \u00c1. S\u1ee9 m\u1ec7nh c\u1ee7a Vietlearn l\u00e0 truy\u1ec1n c\u1ea3m h\u1ee9ng, truy\u1ec1n l\u1eeda, v\u00e0 b\u1ed3i d\u01b0\u1ee1ng th\u1ebf h\u1ec7 tr\u1ebb. Vietlearn mong mu\u1ed1n t\u1ea1o ra s\u1ef1 thay \u0111\u1ed5i v\u1ec1 tr\u00ed tu\u1ec7, nh\u1eadn th\u1ee9c x\u00e3 h\u1ed9i truy\u1ec1n c\u1ea3m h\u1ee9ng, gi\u00fap c\u00e1c em ph\u00e1t huy h\u1ebft ti\u1ec1m n\u0103ng trong vi\u1ec7c h\u1ecdc c\u0169ng nh\u01b0 \u0111i\u1ec3m m\u1ea1nh c\u1ee7a m\u00ecnh.<\/p>\n\n\n\n<p>\u0110\u0103ng k\u00fd kh\u00f3a h\u1ecdc cho con ngay h\u00f4m nay!<\/p>\n\n\n\n<p><\/p>\n\n\n\n<p>\u0110\u1ea1i l\u01b0\u1ee3ng t\u1ec9 l\u1ec7 ngh\u1ecbch \u2013 To\u00e1n l\u1edbp<\/p>\n\n\n\n\n\n<div style=\"display:none\">\nt\u1ed5ng ba g\u00f3c c\u1ee7a m\u1ed9t tam gi\u00e1c<br>\nt\u1ed5ng ba g\u00f3c c\u1ee7a m\u1ed9t tam gi\u00e1c b\u1eb1ng<br>\ntr\u01b0\u1eddng h\u1ee3p b\u1eb1ng nhau th\u1ee9 ba c\u1ee7a tam gi\u00e1c g\u00f3c c\u1ea1nh g\u00f3c<br>\n\u0111\u1ecbnh l\u00ed t\u1ed5ng ba g\u00f3c c\u1ee7a m\u1ed9t tam gi\u00e1c<br>\nto\u00e1n l\u1edbp 7 t\u1ed5ng ba g\u00f3c c\u1ee7a m\u1ed9t tam gi\u00e1c<br>\nb\u00e0i 1 t\u1ed5ng ba g\u00f3c c\u1ee7a m\u1ed9t tam gi\u00e1c<br>\ntr\u01b0\u1eddng h\u1ee3p th\u1ee9 ba c\u1ee7a tam gi\u00e1c g\u00f3c c\u1ea1nh g\u00f3c<br>\nb\u00e0i 6 t\u1ed5ng ba g\u00f3c c\u1ee7a m\u1ed9t tam gi\u00e1c<br>\nto\u00e1n 7 b\u00e0i t\u1ed5ng ba g\u00f3c c\u1ee7a m\u1ed9t tam gi\u00e1c<br>\nt\u1ed5ng ba g\u00f3c c\u1ee7a tam gi\u00e1c<br>\nn\u1ebfu tam gi\u00e1c c\u00f3 ba g\u00f3c nh\u1ecdn<br>\n\u0111\u1ecbnh l\u00fd t\u1ed5ng ba g\u00f3c c\u1ee7a m\u1ed9t tam gi\u00e1c<br>\nt\u1ed5ng ba g\u00f3c trong m\u1ed9t tam gi\u00e1c b\u1eb1ng<br>\ntruong hop bang nhau thu ba cua tam giac goc canh goc<br>\nto\u00e1n h\u00ecnh 7 t\u1ed5ng ba g\u00f3c c\u1ee7a m\u1ed9t tam gi\u00e1c<br>\nt\u1ed5ng ba g\u00f3c c\u1ee7a m\u1ed9t tam gi\u00e1c b\u1eb1ng bao nhi\u00eau<br>\n\u0111\u1ecbnh l\u00fd v\u1ec1 t\u1ed5ng ba g\u00f3c c\u1ee7a m\u1ed9t tam gi\u00e1c<br>\nt\u1ed5ng ba g\u00f3c c\u1ee7a m\u1ed9t tam gi\u00e1c l\u1edbp 7<br>\nb\u00e0i t\u1ed5ng ba g\u00f3c c\u1ee7a m\u1ed9t tam gi\u00e1c<br>\n\u0111\u1ecbnh l\u00ed v\u1ec1 t\u1ed5ng ba g\u00f3c c\u1ee7a m\u1ed9t tam gi\u00e1c<br>\nt\u1ed5ng ba g\u00f3c c\u1ee7a 1 tam gi\u00e1c<br>\nba g\u00f3c c\u1ee7a m\u1ed9t tam gi\u00e1c<br>\nt\u1ed5ng ba g\u00f3c c\u1ee7a tam gi\u00e1c b\u1eb1ng<br>\nt\u1ed5ng ba g\u00f3c trong tam gi\u00e1c<br>\ncho tam gi\u00e1c abc c\u00f3 ba g\u00f3c nh\u1ecdn<br>\nn\u00eau \u0111\u1ecbnh l\u00ed t\u1ed5ng ba g\u00f3c c\u1ee7a m\u1ed9t tam gi\u00e1c<br>\ngi\u1ea3i b\u00e0i t\u1ed5ng ba g\u00f3c c\u1ee7a m\u1ed9t tam gi\u00e1c<br>\nto\u00e1n l\u1edbp 7 b\u00e0i 1 t\u1ed5ng ba g\u00f3c c\u1ee7a m\u1ed9t tam gi\u00e1c<br>\nt\u1ed5ng ba g\u00f3c trong m\u1ed9t tam gi\u00e1c<br>\nt\u1ed5ng ba g\u00f3c c\u1ee7a m\u1ed9t tam gi\u00e1c b\u1eb1ng 180 \u0111\u1ed9<br>\nluy\u1ec7n t\u1eadp t\u1ed5ng ba g\u00f3c c\u1ee7a m\u1ed9t tam gi\u00e1c violet<br>\nl\u00fd thuy\u1ebft t\u1ed5ng ba g\u00f3c c\u1ee7a m\u1ed9t tam gi\u00e1c<br>\nt\u1ed5ng ba g\u00f3c tam gi\u00e1c<br>\nt\u1ed5ng s\u1ed1 \u0111o ba g\u00f3c c\u1ee7a m\u1ed9t tam gi\u00e1c b\u1eb1ng<br>\ntam gi\u00e1c c\u00f3 ba g\u00f3c nh\u1ecdn<br>\nso\u1ea1n b\u00e0i t\u1ed5ng ba g\u00f3c c\u1ee7a m\u1ed9t tam gi\u00e1c<br>\nt\u1ed5ng ba g\u00f3c c\u1ee7a m\u1ed9t tam gi\u00e1c sbt<br>\ntrong m\u1ed9t tam gi\u00e1c t\u1ed5ng ba g\u00f3c b\u1eb1ng<br>\ngi\u1ea3i to\u00e1n 7 t\u1ed5ng ba g\u00f3c c\u1ee7a m\u1ed9t tam gi\u00e1c<br>\nt\u1ed5ng ba g\u00f3c c\u1ee7a m\u1ed9t tam gi\u00e1c b\u1eb1ng b\u00e1o nhi\u1ec1u<br>\nt\u1ed5ng ba g\u00f3c c\u1ee7a m\u1ed9t tam gi\u00e1c l\u00e0<br>\nn\u1ebfu tam gi\u00e1c c\u00f3 ba g\u00f3c nh\u1ecdn th\u00ec<br>\nt\u1ed5ng ba g\u00f3c ngo\u00e0i c\u1ee7a m\u1ed9t tam gi\u00e1c<br>\nt\u1ed5ng ba g\u00f3c c\u1ee7a m\u1ed9t tam gi\u00e1c luy\u1ec7n t\u1eadp<br>\nt\u1ed5ng ba g\u00f3c c\u1ee7a m\u1ed9t tam gi\u00e1c ti\u1ebft 1<br>\nt\u1ed5ng ba g\u00f3c c\u1ee7a m\u1ed9t tam gi\u00e1c l\u00fd thuy\u1ebft<br>\n\u0111\u1ecbnh l\u00ed t\u1ed5ng ba g\u00f3c c\u1ee7a tam gi\u00e1c<br>\nt\u00ednh ch\u1ea5t t\u1ed5ng ba g\u00f3c c\u1ee7a m\u1ed9t tam gi\u00e1c<br>\nluy\u1ec7n t\u1eadp t\u1ed5ng ba g\u00f3c c\u1ee7a m\u1ed9t tam gi\u00e1c<br>\nt\u1ed5ng s\u1ed1 \u0111o ba g\u00f3c c\u1ee7a m\u1ed9t tam gi\u00e1c<br>\n\u0111\u1ecbnh l\u00ed t\u1ed5ng ba g\u00f3c trong m\u1ed9t tam gi\u00e1c<br>\nt\u00ecm s\u1ed1 \u0111o ba g\u00f3c c\u1ee7a m\u1ed9t tam gi\u00e1c c\u00e2n<br>\n1 t\u1ed5ng ba g\u00f3c c\u1ee7a m\u1ed9t tam gi\u00e1c<br>\ncho tam gi\u00e1c abc c\u00f3 ba g\u00f3c nh\u1ecdn n\u1ed9i ti\u1ebfp \u0111\u01b0\u1eddng tr\u00f2n t\u00e2m o<br>\nt\u1ed5ng ba g\u00f3c trong 1 tam gi\u00e1c<br>\nt\u1ed5ng ba g\u00f3c trong m\u1ed9t tam gi\u00e1c nh\u1ecdn b\u1eb1ng<br>\nt\u1ed5ng ba g\u00f3c ngo\u00e0i c\u1ee7a tam gi\u00e1c b\u1eb1ng bao nhi\u00eau<br>\nt\u1ed5ng ba g\u00f3c ngo\u00e0i c\u1ee7a m\u1ed9t tam gi\u00e1c b\u1eb1ng<br>\nt\u1ed5ng ba g\u00f3c tam gi\u00e1c b\u1eb1ng<br>\nto\u00e1n 7 t\u1ed5ng ba g\u00f3c c\u1ee7a m\u1ed9t tam gi\u00e1c sbt<br>\nt\u1ed5ng ba g\u00f3c c\u1ee7a m\u1ed9t tam gi\u00e1c b\u00e0i t\u1eadp<br>\nso\u1ea1n to\u00e1n 7 t\u1ed5ng ba g\u00f3c c\u1ee7a m\u1ed9t tam gi\u00e1c<br>\nb\u00e0i t\u1eadp v\u1ec1 t\u1ed5ng ba g\u00f3c c\u1ee7a m\u1ed9t tam gi\u00e1c<br>\ntong ba goc cua mot tam giac lop 7<br>\nbai tap tong ba goc cua mot tam giac<br>\nt\u1ed5ng ba g\u00f3c c\u1ee7a tam gi\u00e1c b\u1eb1ng bao nhi\u00eau<br>\ntam gi\u00e1c abc c\u00f3 ba g\u00f3c nh\u1ecdn<br>\nba g\u00f3c c\u1ee7a m\u1ed9t tam gi\u00e1c b\u1eb1ng<br>\ngi\u1ea3i b\u00e0i t\u1eadp t\u1ed5ng ba g\u00f3c c\u1ee7a m\u1ed9t tam gi\u00e1c<br>\ntong ba goc trong tam giac<br>\ncho tam gi\u00e1c abc c\u00f3 ba g\u00f3c<br>\nt\u1ed5ng ba g\u00f3c c\u1ee7a m\u1ed9t tam gi\u00e1c ti\u1ebft 2<br>\ntong ba goc cua mot tam giac<br>\n\u0111\u1ecbnh l\u00ed t\u1ed5ng ba g\u00f3c trong tam gi\u00e1c<br>\nc\u00e1ch t\u00ednh t\u1ed5ng ba g\u00f3c c\u1ee7a m\u1ed9t tam gi\u00e1c<br>\nt\u1ed5ng ba g\u00f3c c\u1ee7a m\u1ed9t tam gi\u00e1c vu\u00f4ng<br>\nto\u00e1n 7 h\u00ecnh t\u1ed5ng ba g\u00f3c c\u1ee7a m\u1ed9t tam gi\u00e1c<br>\nt\u1ed5ng ba g\u00f3c c\u1ee7a tam gi\u00e1c b\u1eb1ng bao nhi\u00eau \u0111\u1ed9<br>\nt\u1ed5ng ba g\u00f3c trong m\u1ed9t tam gi\u00e1c b\u1eb1ng bao nhi\u00eau<br>\nch\u1ee7 \u0111\u1ec1 t\u1ed5ng ba g\u00f3c c\u1ee7a m\u1ed9t tam gi\u00e1c<br>\nt\u1ed5ng ba g\u00f3c c\u1ee7a m\u1ed9t tam gi\u00e1c b\u1eb1ng 180 \u0111o<br>\nt\u1ed5ng ba g\u00f3c c\u1ee7a tam gi\u00e1c l\u1edbp 7<br>\n\u0111\u1ecbnh ngh\u0129a t\u1ed5ng ba g\u00f3c c\u1ee7a m\u1ed9t tam gi\u00e1c<br>\ngi\u00e1o \u00e1n b\u00e0i t\u1ed5ng ba g\u00f3c c\u1ee7a m\u1ed9t tam gi\u00e1c<br>\ntr\u1eafc nghi\u1ec7m t\u1ed5ng ba g\u00f3c c\u1ee7a m\u1ed9t tam gi\u00e1c<br>\ncho tam gi\u00e1c abc c\u00f3 ba g\u00f3c nh\u1ecdn n\u1ed9i ti\u1ebfp \u0111\u01b0\u1eddng tr\u00f2n<br>\nb\u00e0i t\u1eadp t\u1ed5ng ba g\u00f3c trong tam gi\u00e1c<br>\ngi\u1ea3i b\u00e0i t\u1eadp b\u00e0i t\u1ed5ng ba g\u00f3c c\u1ee7a m\u1ed9t tam gi\u00e1c<br>\nt\u1ed5ng ba g\u00f3c c\u1ee7a tam gi\u00e1c vu\u00f4ng<br>\nt\u1ed5ng ba g\u00f3c c\u1ee7a m\u1ed9t tam gi\u00e1c l\u00e0 g\u00ec<br>\nt\u1ed5ng s\u1ed1 \u0111o ba g\u00f3c c\u1ee7a m\u1ed9t tam gi\u00e1c l\u00e0<br>\ntong ba goc cua tam giac<br>\ncho tam giac abc co ba goc nhon<br>\ngi\u1ea3i to\u00e1n h\u00ecnh b\u00e0i t\u1ed5ng ba g\u00f3c c\u1ee7a m\u1ed9t tam gi\u00e1c<br>\n\u0111\u1ecbnh l\u00fd c\u1ee7a t\u1ed5ng ba g\u00f3c c\u1ee7a m\u1ed9t tam gi\u00e1c<br>\nto\u00e1n h\u00ecnh b\u00e0i t\u1ed5ng ba g\u00f3c c\u1ee7a m\u1ed9t tam gi\u00e1c<br>\nt\u1ed5ng ba g\u00f3c c\u1ee7a m\u1ed9t tam gi\u00e1c to\u00e1n l\u1edbp 7<br>\nb\u00e0i 1 t\u1ed5ng ba g\u00f3c c\u1ee7a tam gi\u00e1c<br>\nb\u00e0i gi\u1ea3ng t\u1ed5ng ba g\u00f3c c\u1ee7a m\u1ed9t tam gi\u00e1c ti\u1ebft 2<br>\nb\u00e0i gi\u1ea3ng t\u1ed5ng ba g\u00f3c c\u1ee7a m\u1ed9t tam gi\u00e1c<br>\nt\u1ed5ng ba g\u00f3c c\u1ee7a m\u1ed9t tam gi\u00e1c s\u00e1ch b\u00e0i t\u1eadp<br>\ngi\u1ea3i to\u00e1n t\u1ed5ng ba g\u00f3c c\u1ee7a m\u1ed9t tam gi\u00e1c<br>\ngi\u1ea3i to\u00e1n b\u00e0i t\u1ed5ng ba g\u00f3c c\u1ee7a m\u1ed9t tam gi\u00e1c<br>\ntong ba goc ngoai cua tam giac bang bao nhieu<br>\ncho tam gi\u00e1c abc c\u00f3 ba g\u00f3c nh\u1ecdn n\u1ed9i ti\u1ebfp<br>\ngi\u1ea3i to\u00e1n l\u1edbp 7 b\u00e0i 5 tr\u01b0\u1eddng h\u1ee3p b\u1eb1ng nhau th\u1ee9 ba c\u1ee7a tam gi\u00e1c g\u00f3c c\u1ea1nh g\u00f3c<br>\ngiai bai tap toan lop 7 bai tong ba goc cua mot tam giac<br>\nchuy\u00ean \u0111\u1ec1 t\u1ed5ng ba g\u00f3c c\u1ee7a m\u1ed9t tam gi\u00e1c<br>\ntoan 7 bai tong ba goc cua mot tam giac<br>\nt\u1ed5ng ba g\u00f3c c\u1ee7a h\u00ecnh tam gi\u00e1c<br>\ncho tam gi\u00e1c abc c\u00f3 ba g\u00f3c nh\u1ecdn n\u1ed9i ti\u1ebfp \u0111\u01b0\u1eddng tr\u00f2n t\u00e2m o b\u00e1n k\u00ednh r<br>\nb\u00e0i t\u1eadp t\u1ed5ng ba g\u00f3c c\u1ee7a m\u1ed9t tam gi\u00e1c violet<br>\nto\u00e1n h\u00ecnh t\u1ed5ng ba g\u00f3c c\u1ee7a m\u1ed9t tam gi\u00e1c<br>\ngi\u1ea3i b\u00e0i tr\u01b0\u1eddng h\u1ee3p b\u1eb1ng nhau th\u1ee9 ba c\u1ee7a tam gi\u00e1c g\u00f3c c\u1ea1nh g\u00f3c<br>\nt\u1ed5ng ba g\u00f3c c\u1ee7a tam gi\u00e1c l\u00e0<br>\n\u0111\u1ecbnh l\u00fd t\u1ed5ng ba g\u00f3c trong tam gi\u00e1c<br>\nb\u00e0i gi\u1ea3ng \u0111i\u1ec7n t\u1eed t\u1ed5ng ba g\u00f3c trong m\u1ed9t tam gi\u00e1c ti\u1ebft 2<br>\nl\u00fd thuy\u1ebft b\u00e0i t\u1ed5ng ba g\u00f3c c\u1ee7a m\u1ed9t tam gi\u00e1c<br>\nto\u00e1n t\u1ed5ng ba g\u00f3c c\u1ee7a m\u1ed9t tam gi\u00e1c<br>\nt\u1ed5ng ba g\u00f3c c\u1ee7a m\u1ed9t tam gi\u00e1c violet<br>\nph\u00e1t bi\u1ec3u \u0111\u1ecbnh l\u00ed v\u1ec1 t\u1ed5ng ba g\u00f3c c\u1ee7a m\u1ed9t tam gi\u00e1c t\u00ednh ch\u1ea5t g\u00f3c ngo\u00e0i c\u1ee7a tam gi\u00e1c<br>\nsgk to\u00e1n 7 t\u1ed5ng ba g\u00f3c c\u1ee7a m\u1ed9t tam gi\u00e1c<br>\nn\u1ebfu m\u1ed9t tam gi\u00e1c c\u00f3 ba g\u00f3c nh\u1ecdn<br>\nso\u1ea1n to\u00e1n b\u00e0i t\u1ed5ng ba g\u00f3c c\u1ee7a m\u1ed9t tam gi\u00e1c<br>\nso\u1ea1n to\u00e1n h\u00ecnh l\u1edbp 7 b\u00e0i 1 t\u1ed5ng ba g\u00f3c c\u1ee7a m\u1ed9t tam gi\u00e1c<br>\nb\u1eb1ng nhau th\u1ee9 ba c\u1ee7a tam gi\u00e1c g\u00f3c c\u1ea1nh g\u00f3c<br>\nba d\u00f2ng \u0111i\u1ec7n th\u1eb3ng song song vu\u00f4ng g\u00f3c v\u1edbi m\u1eb7t ph\u1eb3ng h\u00ecnh v\u1ebd c\u00f3 chi\u1ec1u nh\u01b0 h\u00ecnh v\u1ebd tam gi\u00e1c abc \u0111\u1ec1u<br>\nt\u1ed5ng ba g\u00f3c c\u1ee7a m\u1ed9t tam gi\u00e1c \u0111\u1ecbnh l\u00fd<br>\nluy\u1ec7n t\u1eadp b\u00e0i t\u1ed5ng ba g\u00f3c c\u1ee7a m\u1ed9t tam gi\u00e1c<br>\nt\u1ed5ng ba g\u00f3c trong m\u1ed9t tam gi\u00e1c b\u1eb1ng 180 \u0111\u1ed9<br>\nto\u00e1n b\u00e0i t\u1ed5ng ba g\u00f3c c\u1ee7a m\u1ed9t tam gi\u00e1c<br>\nt\u1ed5ng ba g\u00f3c trong tam gi\u00e1c vu\u00f4ng<br>\ntrong tam gi\u00e1c t\u1ed5ng ba g\u00f3c b\u1eb1ng 180 \u0111\u1ed9<br>\nph\u00e1t bi\u1ec3u \u0111\u1ecbnh l\u00ed t\u1ed5ng ba g\u00f3c trong tam gi\u00e1c<br>\nb\u00e0i t\u1eadp tr\u01b0\u1eddng h\u1ee3p b\u1eb1ng nhau th\u1ee9 ba c\u1ee7a tam gi\u00e1c g\u00f3c c\u1ea1nh g\u00f3c<br>\nbai 1 tong ba goc cua mot tam giac<br>\nt\u1ed5ng ba g\u00f3c c\u1ee7a m\u1ed9t tam gi\u00e1c l\u00e0 bao nhi\u00eau<br>\nph\u00e1t bi\u1ec3u \u0111\u1ecbnh l\u00ed t\u1ed5ng ba g\u00f3c c\u1ee7a tam gi\u00e1c<br>\ngiai bai tap tong ba goc cua mot tam giac<br>\nsbt to\u00e1n 7 t\u1ed5ng ba g\u00f3c c\u1ee7a m\u1ed9t tam gi\u00e1c<br>\nb\u00e0i t\u1eadp t\u1ed5ng ba g\u00f3c c\u1ee7a m\u1ed9t tam gi\u00e1c<br>\nt\u1ed5ng ba g\u00f3c c\u1ee7a m\u1ed9t tam gi\u00e1c 7<br>\ngiai toan bai tong ba goc cua mot tam giac<br>\nh\u00ecnh h\u1ecdc 7 t\u1ed5ng ba g\u00f3c c\u1ee7a m\u1ed9t tam gi\u00e1c<br>\nt\u1ed5ng ba g\u00f3c c\u1ee7a m\u1ed9t h\u00ecnh tam gi\u00e1c<br>\ngiai toan lop 7 bai tong ba goc cua mot tam giac<br>\ntr\u01b0\u1eddng h\u1ee3p b\u1eb1ng nhau th\u1ee9 ba c\u1ee7a tam gi\u00e1c c\u1ea1nh g\u00f3c c\u1ea1nh<br>\ntong ba goc cua mot tam giac 7<br>\ngi\u1ea3i t\u1ed5ng ba g\u00f3c c\u1ee7a m\u1ed9t tam gi\u00e1c<br>\nc\u00e1c b\u00e0i t\u1eadp v\u1ec1 t\u1ed5ng ba g\u00f3c trong tam gi\u00e1c<br>\nt\u1ed5ng ba g\u00f3c c\u1ee7a m\u1ed9t tam gi\u00e1c b\u00e0i 1<br>\nsoan bai tong ba goc cua mot tam giac<br>\nn\u1ebfu m\u1ed9t tam gi\u00e1c c\u00f3 ba g\u00f3c nh\u1ecdn th\u00ec<br>\ncho tam gi\u00e1c abc c\u00f3 ba g\u00f3c \u0111\u1ec1u nh\u1ecdn<br>\na b c l\u00e0 ba g\u00f3c c\u1ee7a tam gi\u00e1c<br>\nh\u00ecnh tam gi\u00e1c c\u00f3 ba g\u00f3c nh\u1ecdn<br>\ngi\u1ea3i b\u00e0i 1 t\u1ed5ng ba g\u00f3c c\u1ee7a m\u1ed9t tam gi\u00e1c<br>\nto\u00e1n 7 t\u1ed5ng ba g\u00f3c c\u1ee7a m\u1ed9t tam gi\u00e1c<br>\nb\u00e0i t\u1eadp n\u00e2ng cao v\u1ec1 t\u1ed5ng ba g\u00f3c trong tam gi\u00e1c<br>\nt\u1ed5ng ba g\u00f3c trong c\u1ee7a m\u1ed9t tam gi\u00e1c<br>\ntam gi\u00e1c n\u00e0o vu\u00f4ng n\u1ebfu \u0111\u1ed9 l\u1edbn ba g\u00f3c l\u00e0<br>\ntam gi\u00e1c ba g\u00f3c nh\u1ecdn<br>\nc\u00e1c b\u00e0i t\u1eadp v\u1ec1 t\u1ed5ng ba g\u00f3c c\u1ee7a m\u1ed9t tam gi\u00e1c<br>\ntong ba goc cua 1 tam giac<br>\ngi\u00e1o \u00e1n t\u1ed5ng ba g\u00f3c trong m\u1ed9t tam gi\u00e1c<br>\nt\u1ed5ng ba g\u00f3c c\u1ee7a m\u1ed9t tam gi\u00e1c trang 108<br>\nto\u00e1n 7 tr\u01b0\u1eddng h\u1ee3p b\u1eb1ng nhau th\u1ee9 ba c\u1ee7a tam gi\u00e1c g\u00f3c c\u1ea1nh g\u00f3c<br>\nt\u1ed5ng ba g\u00f3c c\u1ee7a m\u1ed9t tam gi\u00e1c to\u00e1n 7<br>\n\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Ghi ch\u00fa: T\u00e0i li\u1ec7u tr\u00edch d\u1eabn S\u1ed1 \u0111o c\u00e1c g\u00f3c trong 1 tam gi\u00e1c c\u00f3 m\u1ed1i li\u00ean h\u1ec7 g\u00ec v\u1edbi nhau? T\u1eeb l\u00e2u, c\u00e1c nh\u00e0 to\u00e1n h\u1ecdc \u0111\u00e3 nh\u1eadn th\u1ea5y gi\u1eefa c\u00e1c g\u00f3c trong tam gi\u00e1c c\u00f3 s\u1ef1 li\u00ean h\u1ec7 ch\u1eb7t ch\u1ebd. H\u00e3y c\u00f9ng theo d\u00f5i b\u00e0i vi\u1ebft sau \u0111\u1ec3 t\u00ecm hi\u1ec3u v\u1ec1 m\u1ed1i l\u00ean [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_disable_autopaging":false},"categories":[9,4],"tags":[],"class_list":["post-2555","post","type-post","status-publish","format-standard","hentry","category-toan-hoc","category-trung-hoc"],"_links":{"self":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/2555","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/comments?post=2555"}],"version-history":[{"count":1,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/2555\/revisions"}],"predecessor-version":[{"id":25689,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/2555\/revisions\/25689"}],"wp:attachment":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/media?parent=2555"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/categories?post=2555"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/tags?post=2555"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}