B\u00e0i 1 (trang 91 SGK H\u00ecnh h\u1ecdc 11):<\/b>\u00a0Cho h\u00ecnh l\u0103ng tr\u1ee5 t\u1ee9 gi\u00e1c ABCD.A‘<\/sup>B‘<\/sup>C‘<\/sup>D‘<\/sup>. M\u1eb7t ph\u1eb3ng (P) c\u1eaft c\u00e1c c\u1ea1nh b\u00ean AA‘<\/sup>, BB‘<\/sup>, CC‘<\/sup>, DD‘<\/sup>\u00a0l\u1ea7n l\u01b0\u1ee3t taih I, K, L, M. X\u00e9t c\u00e1c vect\u01a1 c\u00f3 c\u00e1c \u0111i\u1ec3m \u0111\u1ea7u l\u00e0 c\u00e1c \u0111i\u1ec3m I, K, L, M v\u00e0 c\u00f3 c\u00e1c \u0111i\u1ec3m cu\u1ed1i l\u00e0 c\u00e1c \u0111\u1ec9nh c\u1ee7a h\u00ecnh l\u0103ng tr\u1ee5. H\u00e3y ch\u1ec9 ra c\u00e1c vect\u01a1:<\/p>\n B\u00e0i 8 (trang 92 SGK H\u00ecnh h\u1ecdc 11):<\/b>\u00a0Cho h\u00ecnh l\u0103ng tr\u1ee5 tam gi\u00e1c ABC.A’B’C’ c\u00f3 …<\/p>\n <\/p>\n L\u1eddi gi\u1ea3i<\/strong><\/p>\n <\/p>\n <\/p>\n B\u00e0i 9 (trang 92 SGK H\u00ecnh h\u1ecdc 11):<\/b>\u00a0Cho tam gi\u00e1c ABC. L\u1ea5y m\u1ed9t \u0111i\u1ec3m S ngo\u00e0i m\u1eb7t ph\u1eb3ng (ABC). Tr\u00ean \u0111o\u1ea1n SA l\u1ea5y \u0111i\u1ec3m M sao cho …<\/p>\n <\/p>\n L\u1eddi gi\u1ea3i<\/strong><\/p>\n <\/p>\n <\/p>\n B\u00e0i 10 (trang 92 SGK H\u00ecnh h\u1ecdc 11):<\/b><\/p>\n <\/p>\n L\u1eddi gi\u1ea3i<\/strong><\/p>\n <\/p>\n <\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":" B\u00e0i 1 (trang 91 SGK H\u00ecnh h\u1ecdc 11):\u00a0Cho h\u00ecnh l\u0103ng tr\u1ee5 t\u1ee9 gi\u00e1c ABCD.A‘B‘C‘D‘. M\u1eb7t ph\u1eb3ng (P) c\u1eaft c\u00e1c c\u1ea1nh b\u00ean AA‘, BB‘, CC‘, DD‘\u00a0l\u1ea7n l\u01b0\u1ee3t taih I, K, L, M. X\u00e9t c\u00e1c vect\u01a1 c\u00f3 c\u00e1c \u0111i\u1ec3m \u0111\u1ea7u l\u00e0 c\u00e1c \u0111i\u1ec3m I, K, L, M v\u00e0 c\u00f3 c\u00e1c \u0111i\u1ec3m cu\u1ed1i l\u00e0 c\u00e1c \u0111\u1ec9nh c\u1ee7a h\u00ecnh […]<\/p>\n","protected":false},"author":3,"featured_media":30174,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_mi_skip_tracking":false,"tdm_status":"","tdm_grid_status":""},"categories":[1318],"tags":[1464,1463],"yoast_head":"\n