C\u00e2u 9:<\/b>\u00a0Cho h\u00ecnh n\u00f3n tr\u00f2n xoay c\u00f3 b\u00e1n k\u00ednh \u0111\u00e1y l\u00e0 r v\u00e0 \u0111\u01b0\u1eddng cao 3r\/4. G\u1ecdi 2\u03b1 l\u00e0 g\u00f3c \u1edf \u0111\u1ec9nh c\u1ee7a h\u00ecnh n\u00f3n. K\u1ebft qu\u1ea3 n\u00e0o sau \u0111\u00e2y \u0111\u00fang?<\/p>\n
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C\u00e2u 10:<\/b>\u00a0Kh\u1ed1i n\u00f3n c\u00f3 g\u00f3c \u1edf \u0111\u1ec9nh l\u00e0 60o<\/sup>\u00a0v\u00e0 c\u00f3 th\u1ec3 t\u00edch l\u00e0 \u03c0. \u0110\u1ed9 d\u00e0i \u0111\u01b0\u1eddng sinh c\u1ee7a kh\u1ed1i n\u00f3n l\u00e0:<\/p>\n <\/p>\n C\u00e2u 11:<\/b>\u00a0Cho h\u00ecnh l\u1eadp ph\u01b0\u01a1ng ABCD.A’B’C’D’ c\u1ea1nh a. Di\u1ec7n t\u00edch xung quanh c\u1ee7a h\u00ecnh n\u00f3n c\u00f3 \u0111\u1ec9nh l\u00e0 t\u00e2m O c\u1ee7a h\u00ecnh vu\u00f4ng ABCD v\u00e0 \u0111\u00e1y l\u00e0 h\u00ecnh tr\u00f2n n\u1ed9i ti\u1ebfp h\u00ecnh vu\u00f4ng A\u2019B\u2019C\u2019D\u2019 l\u00e0:<\/p>\n <\/p>\n C\u00e2u 12:<\/b>\u00a0Cho kh\u1ed1i tr\u1ee5 c\u00f3 b\u00e1n k\u00ednh \u0111\u00e1y 4m v\u00e0 \u0111\u01b0\u1eddng cao l\u00e0 5m. Th\u1ec3 t\u00edch kh\u1ed1i tr\u1ee5 l\u00e0:<\/p>\n A. 20\u03c0(m3<\/sup>) \u00a0\u00a0\u00a0B. 60\u03c0(m3<\/sup>) \u00a0\u00a0\u00a0C. 80\u03c0(m3<\/sup>)\u00a0\u00a0\u00a0D.100\u03c0(m3<\/sup>)<\/p>\n C\u00e2u 13:<\/b>\u00a0Cho h\u00ecnh ch\u1eef nh\u1eadt ABCD c\u00f3 AC = 2AD = 2a. Quay quanh tr\u1ee5c AB \u0111\u01b0\u1eddng g\u1ea5p kh\u00fac ADCB ta \u0111\u01b0\u1ee3c h\u00ecnh tr\u1ee5 c\u00f3 di\u1ec7n t\u00edch xung quanh l\u00e0:<\/p>\n A. 6\u03c0a2<\/sup>\u00a0\u00a0\u00a0B. 3\u03c0a2<\/sup>\u00a0\u00a0\u00a0C. 2\u03c0a2<\/sup>\u221a3 \u00a0\u00a0\u00a0D. \u03c0a2<\/sup>\u221a6<\/p>\n C\u00e2u 14:<\/b>\u00a0Cho h\u00ecnh tr\u1ee5 c\u00f3 b\u00e1n k\u00ednh \u0111\u00e1y b\u1eb1ng a v\u00e0 di\u1ec7n t\u00edch to\u00e0n ph\u1ea7n 4\u03c0a2<\/sup>\u00a0. \u0110\u1ed9 d\u00e0i \u0111\u01b0\u1eddng cao c\u1ee7a h\u00ecnh tr\u1ee5 l\u00e0:<\/p>\n A. a\/4 \u00a0\u00a0\u00a0B. a \u00a0\u00a0\u00a0C. a\/2\u00a0\u00a0\u00a0D. 2a<\/p>\n C\u00e2u 15:<\/b>\u00a0Cho h\u00ecnh tr\u1ee5 c\u00f3 di\u1ec7n t\u00edch to\u00e0n ph\u1ea7n 6\u03c0a2<\/sup>\u00a0v\u00e0 thi\u1ebft di\u1ec7n c\u1ee7a h\u00ecnh tr\u1ee5 c\u1eaft b\u1edfi m\u1eb7t ph\u1eb3ng (P) \u0111i qua tr\u1ee5c l\u00e0 m\u1ed9t h\u00ecnh vu\u00f4ng. Chi\u1ec1u cao c\u1ee7a h\u00ecnh tr\u1ee5 l\u00e0:<\/p>\n A. 3a\/4\u00a0\u00a0\u00a0B. a \u00a0\u00a0\u00a0C. 3a\/2 \u00a0\u00a0\u00a0D. 2a<\/p>\n C\u00e2u 16:<\/b>\u00a0Cho h\u00ecnh tr\u1ee5 c\u00f3 di\u1ec7n t\u00edch to\u00e0n ph\u1ea7n l\u00e0 12\u03c0 , \u0111\u01b0\u1eddng cao c\u1ee7a h\u00ecnh tr\u1ee5 l\u00e0 1. Di\u1ec7n t\u00edch xung quanh c\u1ee7a h\u00ecnh tr\u1ee5 l\u00e0:<\/p>\n A. 6\u03c0\u00a0\u00a0\u00a0B. 4\u03c0\u00a0\u00a0\u00a0C. 2\u03c0\u00a0\u00a0\u00a0D. \u03c0<\/p>\n H\u01b0\u1edbng d\u1eabn gi\u1ea3i v\u00e0 \u0110\u00e1p \u00e1n<\/b><\/p>\n <\/p>\n <\/p>\n","protected":false},"excerpt":{"rendered":" C\u00e2u 9:\u00a0Cho h\u00ecnh n\u00f3n tr\u00f2n xoay c\u00f3 b\u00e1n k\u00ednh \u0111\u00e1y l\u00e0 r v\u00e0 \u0111\u01b0\u1eddng cao 3r\/4. G\u1ecdi 2\u03b1 l\u00e0 g\u00f3c \u1edf \u0111\u1ec9nh c\u1ee7a h\u00ecnh n\u00f3n. K\u1ebft qu\u1ea3 n\u00e0o sau \u0111\u00e2y \u0111\u00fang? C\u00e2u 10:\u00a0Kh\u1ed1i n\u00f3n c\u00f3 g\u00f3c \u1edf \u0111\u1ec9nh l\u00e0 60o\u00a0v\u00e0 c\u00f3 th\u1ec3 t\u00edch l\u00e0 \u03c0. \u0110\u1ed9 d\u00e0i \u0111\u01b0\u1eddng sinh c\u1ee7a kh\u1ed1i n\u00f3n l\u00e0: C\u00e2u 11:\u00a0Cho […]<\/p>\n","protected":false},"author":3,"featured_media":28750,"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 9-B<\/td>\n 10-A<\/td>\n 11-A<\/td>\n 12-C<\/td>\n 13-C<\/td>\n 14-B<\/td>\n 15-D<\/td>\n 16-B<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n