C\u00e2u 1:<\/b>\u00a0T\u00ednh th\u1ec3 t\u00edch V c\u1ee7a m\u1ed9t t\u1ee9 di\u1ec7n \u0111\u1ec1u c\u00f3 c\u1ea1nh b\u1eb1ng a.<\/p>\n
<\/p>\n
C\u00e2u 2:<\/b>\u00a0T\u00ednh th\u1ec3 t\u00edch V c\u1ee7a h\u00ecnh ch\u00f3p tam gi\u00e1c \u0111\u1ec1u S.ABC c\u00f3 c\u1ea1nh \u0111\u00e1y b\u1eb1ng a, m\u1eb7t b\u00ean (SAB) t\u1ea1o v\u1edbi \u0111\u00e1y m\u1ed9t g\u00f3c b\u1eb1ng 60o<\/sup>\u00a0.<\/p>\n <\/p>\n C\u00e2u 3:<\/b>\u00a0Cho kh\u1ed1i ch\u00f3p S.ABC c\u00f3 \u0111\u00e1y l\u00e0 tam gi\u00e1c \u0111\u1ec1u c\u1ea1nh a, h\u00ecnh chi\u1ebfu c\u1ee7a S l\u00ean m\u1eb7t ph\u1eb3ng (ABC) tr\u00f9ng v\u1edbi trung \u0111i\u1ec3m c\u1ee7a c\u1ea1nh AB, c\u1ea1nh b\u00ean SC t\u1ea1o v\u1edbi \u0111\u00e1y m\u1ed9t g\u00f3c b\u1eb1ng 60o<\/sup>. T\u00ednh th\u1ec3 t\u00edch V c\u1ee7a kh\u1ed1i ch\u00f3p \u0111\u00f3.<\/p>\n <\/p>\n C\u00e2u 4:<\/b>\u00a0T\u00ednh th\u1ec3 t\u00edch V c\u1ee7a h\u00ecnh ch\u00f3p S.ABC c\u00f3 \u0111\u00e1y l\u00e0 tam gi\u00e1c \u0111\u1ec1u c\u00f3 c\u1ea1nh b\u1eb1ng a. SA vu\u00f4ng g\u00f3c v\u1edbi \u0111\u00e1y, m\u1eb7t ph\u1eb3ng (SBC) t\u1ea1o v\u1edbi \u0111\u00e1y m\u1ed9t g\u00f3c b\u1eb1ng 60o<\/sup>.<\/p>\n <\/p>\n C\u00e2u 5:<\/b>\u00a0T\u00ednh th\u1ec3 t\u00edch V c\u1ee7a h\u00ecnh ch\u00f3p S.ABC c\u00f3 \u0111\u00e1y l\u00e0 tam gi\u00e1c \u0111\u1ec1u c\u00f3 c\u1ea1nh b\u1eb1ng a. SA vu\u00f4ng g\u00f3c v\u1edbi \u0111\u00e1y, di\u1ec7n t\u00edch tam gi\u00e1c SBC b\u1eb1ng<\/p>\n <\/p>\n C\u00e2u 6:<\/b>\u00a0Cho h\u00ecnh ch\u00f3p S.ABC c\u00f3 \u0111\u00e1y l\u00e0 tam gi\u00e1c vu\u00f4ng t\u1ea1i A, SAB l\u00e0 tam gi\u00e1c \u0111\u1ec1u c\u1ea1nh a, m\u1eb7t (SAB) vu\u00f4ng g\u00f3c v\u1edbi \u0111\u00e1y, g\u00f3c SCA = 60o<\/sup>\u00a0. T\u00ednh th\u1ec3 t\u00edch V c\u1ee7a h\u00ecnh ch\u00f3p \u0111\u00f3.<\/p>\n <\/p>\n C\u00e2u 7:<\/b>\u00a0Cho h\u00ecnh ch\u00f3p S.ABC \u0111\u00e1y l\u00e0 tam gi\u00e1c vu\u00f4ng t\u1ea1i A, SAB l\u00e0 tam gi\u00e1c \u0111\u1ec1u c\u1ea1nh a, h\u00ecnh chi\u1ebfu c\u1ee7a S l\u00ean m\u1eb7t \u0111\u00e1y tr\u00f9ng v\u1edbi trung \u0111i\u1ec3m c\u1ee7a AB, c\u1ea1nh BC t\u1ea1o v\u1edbi m\u1eb7t b\u00ean (SAC) m\u1ed9t g\u00f3c 45o<\/sup>\u00a0. T\u00ednh th\u1ec3 t\u00edch V c\u1ee7a h\u00ecnh ch\u00f3p \u0111\u00f3.<\/p>\n <\/p>\n H\u01b0\u1edbng d\u1eabn gi\u1ea3i v\u00e0 \u0110\u00e1p \u00e1n<\/b><\/p>\n C\u00e2u 1:<\/b><\/p>\n Cho t\u1ee9 di\u1ec7n \u0111\u1ec1u ABCD, H l\u00e0 t\u00e2m c\u1ee7a tam gi\u00e1c ABC th\u00ec DH \u22a5 (ABC), t\u00ednh DH theo DA = a v\u00e0 AH = a\u221a3\/3<\/p>\n <\/p>\n","protected":false},"excerpt":{"rendered":" C\u00e2u 1:\u00a0T\u00ednh th\u1ec3 t\u00edch V c\u1ee7a m\u1ed9t t\u1ee9 di\u1ec7n \u0111\u1ec1u c\u00f3 c\u1ea1nh b\u1eb1ng a. C\u00e2u 2:\u00a0T\u00ednh th\u1ec3 t\u00edch V c\u1ee7a h\u00ecnh ch\u00f3p tam gi\u00e1c \u0111\u1ec1u S.ABC c\u00f3 c\u1ea1nh \u0111\u00e1y b\u1eb1ng a, m\u1eb7t b\u00ean (SAB) t\u1ea1o v\u1edbi \u0111\u00e1y m\u1ed9t g\u00f3c b\u1eb1ng 60o\u00a0. C\u00e2u 3:\u00a0Cho kh\u1ed1i ch\u00f3p S.ABC c\u00f3 \u0111\u00e1y l\u00e0 tam gi\u00e1c \u0111\u1ec1u c\u1ea1nh a, h\u00ecnh […]<\/p>\n","protected":false},"author":3,"featured_media":28903,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_mi_skip_tracking":false,"tdm_status":"","tdm_grid_status":""},"categories":[157],"tags":[1450,1448],"yoast_head":"\n\n\n
\n 1-C<\/td>\n 2-A<\/td>\n 3-C<\/td>\n 4-B<\/td>\n 5-D<\/td>\n 6-B<\/td>\n 7-C<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n