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{"id":22372,"date":"2018-03-19T13:47:39","date_gmt":"2018-03-19T06:47:39","guid":{"rendered":"https:\/\/lop12.edu.vn\/?p=22372"},"modified":"2018-03-19T13:47:39","modified_gmt":"2018-03-19T06:47:39","slug":"hinh-hoc-chuong-1-on-tap-chuong-1-cau-hoi-trac-nghiem","status":"publish","type":"post","link":"https:\/\/lop12.edu.vn\/hinh-hoc-chuong-1-on-tap-chuong-1-cau-hoi-trac-nghiem\/","title":{"rendered":"H\u00ecnh h\u1ecdc – Ch\u01b0\u01a1ng 1 – \u00d4n t\u1eadp ch\u01b0\u01a1ng 1 – C\u00e2u h\u1ecfi tr\u1eafc nghi\u1ec7m"},"content":{"rendered":"

B\u00e0i 1 (trang 31 sgk H\u00ecnh H\u1ecdc 12 n\u00e2ng cao):<\/b><\/p>\n

M\u1ed7i \u0111\u1ec9nh c\u1ee7a h\u00ecnh \u0111a di\u1ec7n l\u00e0 \u0111\u1ec9nh chung c\u1ee7a \u00edt nh\u1ea5t:<\/p>\n

A. M\u1ed9t c\u1ea1nh\u00a0\u00a0\u00a0B. B\u1ed1n c\u1ea1nh\u00a0\u00a0\u00a0C. Ba c\u1ea1nh\u00a0\u00a0\u00a0D. Hai c\u1ea1nh<\/p>\n

L\u1eddi gi\u1ea3i:<\/b><\/p>\n

V\u00ec kh\u00f4ng c\u00f3 h\u00ecnh da di\u1ec7n n\u00e0o l\u00e0 m\u1ed7i \u0111\u1ec9nh l\u00e0 \u0111\u1ec9nh chung c\u1ee7a m\u1ed9t c\u1ea1nh.<\/p>\n

Ch\u1ecdn C<\/p>\n

B\u00e0i 2 (trang 31 sgk H\u00ecnh H\u1ecdc 12 n\u00e2ng cao):<\/b><\/p>\n

Cho kh\u1ed1i ch\u00f3p c\u00f3 \u0111\u00e1y l\u00e0 n \u2013 gi\u00e1c, trong c\u00e1c m\u1ec7nh \u0111\u1ec1 sau m\u1ec7nh \u0111\u1ec1 \u0111\u00fang l\u00e0:<\/p>\n

A. S\u1ed1 c\u1ea1nh c\u1ee7a kh\u1ed1i ch\u00f3p l\u00e0 n + 1.<\/p>\n

B. S\u1ed1 m\u1eb7t c\u1ee7a kh\u1ed1i ch\u00f3p b\u1eb1ng 2n<\/p>\n

C. S\u1ed1 \u0111\u1ec9nh c\u1ee7a kh\u1ed1i ch\u00f3p l\u00e0 2n + 1<\/p>\n

D. S\u1ed1 m\u1eb7t c\u1ee7a kh\u1ed1i ch\u00f3p b\u1eb1ng s\u1ed1 \u0111\u1ec9nh c\u1ee7a n\u00f3.<\/p>\n

L\u1eddi gi\u1ea3i:<\/b><\/p>\n

Ch\u1ecdn D<\/p>\n

B\u00e0i 3 (trang 32 sgk H\u00ecnh H\u1ecdc 12 n\u00e2ng cao):<\/b><\/p>\n

Ph\u00e9p \u0111\u1ed1i x\u1ee9ng qua mp (P) bi\u1ebfn \u0111\u01b0\u1eddng th\u1eb3ng d th\u00e0nh ch\u00ednh n\u00f3 khi v\u00e0 ch\u1ec9 khi:<\/p>\n

A. d song song v\u1edbi (P);\u00a0\u00a0\u00a0B. d n\u1eb1m tr\u00ean (P);<\/p>\n

C. d \u22a5 (P) \u00a0\u00a0\u00a0 D. d n\u1eb1m tr\u00ean (P) ho\u1eb7c d \u22a5 (P).<\/p>\n

L\u1eddi gi\u1ea3i:<\/b><\/p>\n

Ch\u1ecdn D<\/p>\n

B\u00e0i 4 (trang 32 sgk H\u00ecnh H\u1ecdc 12 n\u00e2ng cao):<\/b><\/p>\n

Cho hai \u0111\u01b0\u1eddng th\u1eb3ng d v\u00e0 d\u2019 c\u1eaft nhau. C\u00f3 bao nhi\u00eau ph\u00e9p \u0111\u1ed1i x\u1ee9ng qua m\u1eb7t ph\u1eb3ng bi\u1ebfn d th\u00e0nh d\u2019.<\/p>\n

A. c\u00f3 m\u1ed9t\u00a0\u00a0\u00a0 B. c\u00f3 hai\u00a0\u00a0\u00a0C. kh\u00f4ng c\u00f3\u00a0\u00a0\u00a0D. c\u00f3 v\u00f4 s\u1ed1.<\/p>\n

L\u1eddi gi\u1ea3i:<\/b><\/p>\n

Ph\u00e9p \u0111\u1ed1i x\u1ee9ng qua m\u1eb7t ph\u1eb3ng ch\u1ee9a \u0111\u01b0\u1eddng ph\u1ea7n go\u00e1c c\u1ee7a g\u00f3c t\u1ea1o b\u1edfi hai \u0111\u01b0\u1eddng th\u1eb3ng c\u1eaft nhau d, d\u2019 v\u00e0 vu\u00f4ng g\u00f3c v\u1edbi mp (d, d\u2019) bi\u1ebfn d th\u00e0nh d\u2019. v\u00ec hai d\u01b0\u1eddng th\u1eb3ng c\u1eaft nhau d, d\u2019 c\u00f3 hai ph\u00e2n gi\u00e1c n\u00ean c\u00f3 hai ph\u00e9p \u0111\u1ed1i x\u1ee9ng qua m\u1eb7t ph\u1eb3ng bi\u1ebfn d th\u00e0nh d\u2019.<\/p>\n

Ch\u1ecdn B<\/p>\n

B\u00e0i 5 (trang 32 sgk H\u00ecnh H\u1ecdc 12 n\u00e2ng cao):<\/b><\/p>\n

Cho hai \u0111\u01b0\u1eddng th\u1eb3ng ph\u00e2n bi\u1ec7t d v\u00e0 d\u2019 \u0111\u1ed3ng ph\u1eb3ng. C\u00f3 bao nhi\u00eau ph\u00e9p \u0111\u1ed1i x\u1ee9ng qua m\u1eb7t ph\u1eb3ng bi\u1ebfn d th\u00e0nh d\u2019.<\/p>\n

A. kh\u00f4ng c\u00f3\u00a0\u00a0\u00a0 B. c\u00f3 m\u1ed9t\u00a0\u00a0\u00a0C. C\u00f3 hai\u00a0\u00a0\u00a0D. c\u00f3 m\u1ed9t ho\u1eb7c hai.<\/p>\n

L\u1eddi gi\u1ea3i:<\/b><\/p>\n

\"\"<\/p>\n

V\u00ec d, d\u2019 ph\u00e2n bi\u1ec7t v\u00e0 \u0111\u1ed3ng ph\u1eb3ng n\u00ean d \/\/ d\u2019 ho\u1eb7c d c\u1eaft d\u2019.<\/p>\n

– n\u1ebfu d \/\/ d\u2019 th\u00ec c\u00f3 1 ph\u00e9p \u0111\u1ed1i x\u1ee9ng qua m\u1eb7t ph\u1eb3ng bi\u1ebfn d th\u00e0nh d\u2019, (\u0111\u00f3 l\u00e0 m\u1eb7t ph\u1eb3ng vu\u00f4ng g\u00f3c v\u1edbi m\u1eb7t ph\u1eb3ng (d, d\u2019)<\/p>\n

– N\u1ebfu d c\u1eaft d\u2019, c\u00f3 ph\u00e9p \u0111\u1ed1i x\u1ee9ng qua m\u1eb7t ph\u1eb3ng bi\u1ebfn d th\u00e0nh a\u2019 (xem c\u00e2u 4).<\/p>\n

Ch\u1ecdn D<\/p>\n

B\u00e0i 6 (trang 32 sgk H\u00ecnh H\u1ecdc 12 n\u00e2ng cao):<\/b><\/p>\n

H\u00ecnh ch\u00f3p t\u1ee9 gi\u00e1c \u0111\u1ec1u c\u00f3 bao nhi\u00eau m\u1eb7t ph\u1eb3ng \u0111\u1ed1i x\u1ee9ng.<\/p>\n

A. m\u1ed9t\u00a0\u00a0\u00a0 B. hai\u00a0\u00a0\u00a0C. ba\u00a0\u00a0\u00a0D. b\u1ed1n<\/p>\n

L\u1eddi gi\u1ea3i:<\/b><\/p>\n

\"\"<\/p>\n

H\u00ecnh ch\u00f3p t\u1ee9 gi\u00e1c \u0111\u1ec1u S.ABCD c\u00f3 4 m\u1eb7t ph\u1eb3ng \u0111\u1ed1i x\u1ee9ng l\u00e0: (SAC), (SBD), m\u1eb7t ph\u1eb3ng trung tr\u1ef1c c\u1ee7a c\u00e1c c\u1ea1nh AB, AD,<\/p>\n

Ch\u1ecdn D<\/p>\n

B\u00e0i 7 (trang 32 sgk H\u00ecnh H\u1ecdc 12 n\u00e2ng cao):<\/b><\/p>\n

M\u1ed9t h\u00ecnh h\u1ed9p \u0111\u1ee9ng c\u00f3 \u0111\u00e1y l\u00e0 h\u00ecnh thoi (kh\u00f4ng ph\u1ea3i h\u00ecnh vu\u00f4ng) c\u00f3 bao nhi\u00eau m\u1eb7t ph\u1eb3ng \u0111\u1ed1i x\u1ee9ng.<\/p>\n

A. m\u1ed9t\u00a0\u00a0\u00a0 B. hai\u00a0\u00a0\u00a0C. ba\u00a0\u00a0\u00a0D. b\u1ed1n<\/p>\n

L\u1eddi gi\u1ea3i:<\/b><\/p>\n

<\/div>\n

\"\"<\/p>\n

H\u00ecnh thoi c\u00f3 hai \u0111\u01b0\u1eddng ch\u00e9o vu\u00f4ng g\u00f3c v\u00e0 c\u1eaft nhau t\u1ea1i trung \u0111i\u1ec3, c\u1ee7a m\u1ed7i \u0111\u01b0\u1eddng, ABCD.A\u2019B\u2019C\u2019D\u2019 l\u00e0 h\u00ecnh h\u1ed9p \u0111\u1ee9ng c\u00f3 \u0111\u00e1y l\u00e0 h\u00ecnh thoi (kh\u00f4ng ph\u1ea3i h\u00ecnh vu\u00f4ng) c\u00f3 c\u00e1c m\u1eb7t ph\u1eb3ng \u0111\u1ed1i x\u1ee9ng l\u00e0: (ACC\u2019A\u2019), (BDD\u2019B\u2019), m\u1eb7t ph\u1eb3ng trung tr\u1ef1c c\u1ee7a c\u1ea1nh AA\u2019<\/p>\n

Ch\u1ecdn C<\/p>\n

B\u00e0i 8 (trang 32 sgk H\u00ecnh H\u1ecdc 12 n\u00e2ng cao):<\/b><\/p>\n

Cho ph\u00e9p v\u1ecb t\u1ef1 tam O bi\u1ebfn \u0111i\u1ec3m A th\u00e0nh \u0111i\u1ec3m B, bi\u1ebft r\u1eb1ng OA = 2OB. Khi \u0111\u00f3 t\u1ef7 s\u1ed1 ph\u00e9p v\u1ecb t\u1ef1 l\u00e0 bao nhi\u00eau.<\/p>\n

A. 2\u00a0\u00a0\u00a0 B. -2\u00a0\u00a0\u00a0C. \u00b11\/2\u00a0\u00a0\u00a0D. 1\/2<\/p>\n

L\u1eddi gi\u1ea3i:<\/b><\/p>\n

\"\"<\/p>\n

Ch\u1ecdn C<\/p>\n

\n
<\/div>\n
\n

B\u00e0i 9 (trang 32 sgk H\u00ecnh H\u1ecdc 12 n\u00e2ng cao):<\/b><\/p>\n

Cho hai \u0111\u01b0\u1eddng th\u1eb3ng song song v\u1edbi d v\u00e0 d\u2019 v\u00e0 m\u1ed9t \u0111i\u1ec3m O, kh\u00f4ng n\u1eb1m tr\u00ean ch\u00fang. C\u00f3 bao nhi\u00eau ph\u00e9p v\u1ecb t\u1ef1 l\u00e0 bao nhi\u00eau?<\/p>\n

A. c\u00f3 m\u1ed9t\u00a0\u00a0\u00a0 B. kh\u00f4ng c\u00f3:<\/p>\n

C. c\u00f3 hai\u00a0\u00a0\u00a0D. c\u00f3 m\u1ed9t ho\u1eb7c kh\u00f4ng c\u00f3.<\/p>\n

L\u1eddi gi\u1ea3i:<\/b><\/p>\n

\"\"<\/div>\n

 <\/p>\n

– N\u1ebfu O \u2208mp(d,d\u2019) th\u00ec kh\u00f4ng c\u00f3 ph\u00e9p v\u1ecb t\u1ef1 n\u00e0o bi\u1ebfn d th\u00e0nh d\u2019<\/p>\n

– N\u1ebfu O \u2208 mp(d, d\u2019), O \u2208d,O \u2208d’. C\u00f3 1 ph\u00e9p v\u1ecb t\u1ef1 t\u00e2m O bi\u1ebfn d th\u00e0nh d;<\/p>\n

Ch\u1ecdn D<\/p>\n

B\u00e0i 10 (trang 32 sgk H\u00ecnh H\u1ecdc 12 n\u00e2ng cao):<\/b>\u00a0Kh\u1ed1i 8 m\u1eb7t \u0111\u1ec1u thu\u1ed9c lo\u1ea1i:<\/p>\n

A. {3; 3}\u00a0\u00a0\u00a0 B. {4; 3}\u00a0\u00a0\u00a0C. {5, 3}\u00a0\u00a0\u00a0D. {3, -4}<\/p>\n

L\u1eddi gi\u1ea3i:<\/b><\/p>\n

Kh\u1ed1i 8 m\u1eb7t \u0111\u1ec1u c\u00f3 m\u1ed7i m\u1eb7t l\u00e0 tam gi\u00e1c \u0111\u1ec1u c\u00f3 m\u1ed7i m\u1eb7t l\u00e0 tam gi\u00e1c \u0111\u1ec1u, m\u1ed7i \u0111\u1ec9nh l\u00e0 \u0111\u1ec9nh chung c\u1ee7a 4 c\u1ea1nh n\u00ean l\u00e0 da di\u1ec7n \u0111\u1ec1u lo\u1ea1i {3, 4}<\/p>\n

Ch\u1ecdn D<\/p>\n

\n
\n

B\u00e0i 11 (trang 33 sgk H\u00ecnh H\u1ecdc 12 n\u00e2ng cao):<\/b><\/p>\n

Kh\u1ed1i 20 m\u1eb7t \u0111\u1ec1u thu\u1ed9c lo\u1ea1i:<\/p>\n

A. {3; 4}\u00a0\u00a0\u00a0 B. {3; 5}\u00a0\u00a0\u00a0 C. {4; 3} \u00a0\u00a0\u00a0 D. {4; 5}<\/p>\n

L\u1eddi gi\u1ea3i:<\/b><\/p>\n

Kh\u1ed1i 20 m\u1eb7t \u0111\u1ec1u c\u00f3: m\u1ed7i m\u1eb7t l\u00e0 tam gi\u00e1c \u0111\u1ec1u, m\u1ed7i \u0111\u1ec9nh chung c\u1ee7a 5 c\u1ea1nh n\u00ean \u0111a di\u1ec7n \u0111\u1ec1u lo\u1ea1i {3, 5}.<\/p>\n

Ch\u1ecdn B<\/p>\n

B\u00e0i 12 (trang 33 sgk H\u00ecnh H\u1ecdc 12 n\u00e2ng cao):<\/b><\/p>\n

N\u1ebfu ba k\u00edch th\u01b0\u1edbc c\u1ee7a m\u1ed9t kh\u1ed1i h\u1ed9p ch\u1eef nh\u1eadt t\u0103ng l\u00ean k l\u1ea7n th\u00ec th\u1ec3 t\u00edch c\u1ee7a n\u00f3 t\u0103ng l\u00ean:<\/p>\n

A. k l\u1ea7n\u00a0\u00a0\u00a0B. k2<\/sup>\u00a0l\u1ea7n\u00a0\u00a0\u00a0C. k3<\/sup>\u00a0l\u1ea7n\u00a0\u00a0\u00a0D. 3k3<\/sup>\u00a0l\u1ea7n<\/p>\n

L\u1eddi gi\u1ea3i:<\/b><\/p>\n

Ba k\u00edch th\u01b0\u1edbc c\u1ee7a kh\u1ed1i h\u1ed9p l\u00e0 a, b, c, th\u00ec th\u1ec3 t\u00edch c\u1ee7a n\u00f3 V = abc, n\u1ebfu t\u0103ng m\u1ed7i k\u00edch th\u01b0\u1edbc l\u00ean k l\u1ea7n th\u00ec th\u1ec3 t\u00edch (ka) (kb) (kc) = k3<\/sup>V. v\u1eady th\u1ec3 t\u00edch t\u0103ng l\u00ean k3<\/sup>\u00a0l\u1ea7n<\/p>\n

Ch\u1ecdn C<\/p>\n

B\u00e0i 13 (trang 33 sgk H\u00ecnh H\u1ecdc 12 n\u00e2ng cao):<\/b><\/p>\n

T\u1ed5ng di\u1ec7n t\u00edch c\u00e1c m\u1eb7t c\u1ee7a m\u1ed9t h\u00ecnh l\u1eadp Ph\u01b0\u01a1ng b\u1eb1ng 96. Th\u1ec3 t\u00edch c\u1ee7a kh\u1ed1i l\u1eadp Ph\u01b0\u01a1ng \u0111\u00f3 l\u00e0:<\/p>\n

A. 64\u00a0\u00a0\u00a0B. 94\u00a0\u00a0\u00a0C. 84\u00a0\u00a0\u00a0D. 48<\/p>\n

L\u1eddi gi\u1ea3i:<\/b><\/p>\n

H\u00ecnh l\u1eadp Ph\u01b0\u01a1ng c\u1ea1nh a c\u00f3 t\u1ed5ng di\u1ec7n t\u00edch c\u00e1c m\u1eb7t l\u00e0:<\/p>\n

6a2<\/sup>=96=>a=4=>V=a3<\/sup>=64<\/p>\n

Ch\u1ecdn A<\/p>\n

\n
\n

B\u00e0i 14 (trang 33 sgk H\u00ecnh H\u1ecdc 12 n\u00e2ng cao):<\/b><\/p>\n

Ba k\u00edch th\u01b0\u1edbc c\u1ee7a m\u1ed9t h\u1ed9p ch\u1eef nh\u1eadt l\u00e0m th\u00e0nh m\u1ed9t c\u1ea5p s\u1ed1 nh\u00e2n c\u00f3 c\u1ed9ng b\u1ed9i l\u00e0 2. Th\u1ec3 t\u00edch h\u00ecnh h\u1ed9p \u0111\u00e3 cho l\u00e0 1728. Khi \u0111\u00f3 c\u00e1c k\u00edch th\u01b0\u1edbc c\u1ee7a h\u00ecnh h\u1ed9p l\u00e0:<\/p>\n

A. 8, 16, 32<\/p>\n

B. 2,4, 8<\/p>\n

C. 2\u221a3, 4\u221a4, 38<\/p>\n

D. 6, 12, 24<\/p>\n

L\u1eddi gi\u1ea3i:<\/b><\/p>\n

G\u1ecdi 3 k\u00edch th\u01b0\u1edbc c\u1ee7a h\u00ecnh h\u1ed9p ch\u1eef nh\u1eadt \u0111\u00f3 l\u00e0: a, 2a, 4a.<\/p>\n

=>V=a.2a.4a=8a3<\/sup><\/p>\n

\"\"<\/p>\n

V\u1eady 3 k\u00edch th\u01b0\u1edbc l\u00e0: 6, 12, 24 => Ch\u1ecdn D<\/p>\n

\n
\n

B\u00e0i 15 (trang 33 sgk H\u00ecnh H\u1ecdc 12 n\u00e2ng cao):<\/b><\/p>\n

C\u00e1c \u0111\u01b0\u1eddng ch\u00e9o c\u1ee7a c\u00e1c m\u1eb7t c\u1ee7a h\u00ecnh h\u1ed9p ch\u1eef nh\u1eadt l\u00e0 a \u221a5,a \u221a13 . Th\u1ec3 t\u00edch c\u1ee7a h\u00ecnh h\u1ed9p \u0111\u00f3 l\u00e0:<\/p>\n

A. 4\u00a0\u00a0\u00a0 B. 5\u00a0\u00a0\u00a0C. 6\u00a0\u00a0\u00a0D. 8<\/p>\n

L\u1eddi gi\u1ea3i:<\/b><\/p>\n

G\u1ecdi 3 k\u00edch th\u01b0\u1edbc c\u1ee7a h\u00ecnh h\u1ed9p l\u00e0 x, y, z. khi c\u00e1c \u0111\u01b0\u1eddng ch\u00e9o c\u1ee7a 3 m\u1eb7t (\u0111\u00f4i m\u1ed9t kh\u00f4ng song song) l\u00e0<\/p>\n

\"\"<\/p>\n

Ch\u1ecdn C<\/p>\n

\n
\n

B\u00e0i 16 (trang 33 sgk H\u00ecnh H\u1ecdc 12 n\u00e2ng cao):<\/b><\/p>\n

M\u1ed9t kh\u1ed1i l\u0103ng tr\u1ee5 \u0111\u1ee9ng tam gi\u00e1c c\u00f3 c\u00e1c c\u1ea1nh \u0111\u00e1y b\u1eb1ng 37 cm, 13 cam, 30 cam, v\u00e0 di\u1ec7n t\u00edch xung quanh b\u1eb1ng 480 cm2<\/sup>. Khi \u0111\u00f3 th\u1ec3 t\u00edch c\u1ee7a kh\u1ed1i l\u0103ng tr\u1ee5 l\u00e0.<\/p>\n

A. 2010\u00a0\u00a0\u00a0 B. 1010\u00a0\u00a0\u00a0C. 1080\u00a0\u00a0\u00a0D. 2040<\/p>\n

L\u1eddi gi\u1ea3i:<\/b><\/p>\n

\"\"<\/div>\n

 <\/p>\n

Sxq<\/sub>=h.2p =80h<\/p>\n

(v\u1edbi h: chi\u1ec1u cao, 2p chu vi \u0111\u00e1y)<\/p>\n

M\u00e0 Sxq<\/sub>=480<\/p>\n

=>h=480\/80= 6<\/p>\n

V=h.s=6.180=1080<\/p>\n

Ch\u1ecdn C<\/p>\n

\n
\n

B\u00e0i 17 (trang 33 sgk H\u00ecnh H\u1ecdc 12 n\u00e2ng cao):<\/b><\/p>\n

M\u1ed9t kh\u1ed1i l\u0103ng tr\u1ee5 tam gi\u00e1c c\u00f3 c\u00e1c c\u1ea1nh \u0111\u00e1y b\u1eb1ng 13 cam, 14 cm, 15 cm c\u1ea1nh b\u00ean t\u1ea1o v\u1edbi m\u1eb7t ph\u1eb3ng \u0111\u00e1y m\u1ed9t g\u00f3c 30o<\/sup>\u00a0v\u00e0 c\u00f3 chi\u1ec1u d\u00e0i l\u00e0 8 cm. Khi \u0111\u00f3 th\u1ebb t\u00edch c\u1ee7a kh\u1ed1i l\u0103ng tr\u1ee5 l\u00e0:<\/p>\n

A. 340\u00a0\u00a0\u00a0B. 336\u00a0\u00a0\u00a0C. 274 \u221a3\u00a0\u00a0\u00a0D. 124 \u221a3<\/p>\n

L\u1eddi gi\u1ea3i:<\/b><\/p>\n

\"\"<\/div>\n

S\u0111\u00e1y<\/sub>=84 cm2<\/sup>\u00a0(theo c\u00f4ng th\u1ee9c her\u00f4ng)<\/p>\n

G\u1ecdi H l\u00e0 h\u00ecnh chi\u1ebfu c\u1ee7a A tr\u00ean (A\u2019B\u2019C\u2019)<\/p>\n

=> g\u00f3c AA’H=30o<\/sup>,AA’=8<\/p>\n

AH = AA\u2019. sin30o<\/sup>= 4 = h<\/p>\n

=>V = S\u0111\u00e1y<\/sub>.h=84.4=336<\/p>\n

Ch\u1ecdn B<\/p>\n

\n
\n

B\u00e0i 18 (trang 33 sgk H\u00ecnh H\u1ecdc 12 n\u00e2ng cao):<\/b><\/p>\n

\u0110\u00e1y c\u1ee7a m\u1ed9t h\u00ecnh h\u1ed9p \u0111\u1ee9ng l\u00e0 h\u00ecnh thoi c\u1ea1nh a, g\u00f3c nh\u1ecdn \u301660\u3017^0. \u0110\u01b0\u1eddng ch\u00e9o l\u1edbn c\u1ee7a \u0111\u00e1y b\u1eb1ng \u0111\u01b0\u1eddng ch\u00e9o nh\u1ecf c\u1ee7a h\u00ecnh h\u1ed9p. Khi \u0111\u00f3 th\u1ec3 t\u00edch c\u1ee7a h\u00ecnh h\u1ed9p l\u00e0:<\/p>\n

\"\"<\/p>\n

L\u1eddi gi\u1ea3i:<\/b><\/p>\n

\"\"<\/div>\n

X\u00e9t h\u00ecnh h\u1ed9p \u0111\u1ee9ng ABCD.A\u2019B\u2019C\u2019D\u2019 c\u00f3 g\u00f3c BAD=60o<\/sup>=>AC>BD.<\/p>\n

Trong h\u00ecnh thoi ABCD: AC2<\/sup>+BD2<\/sup>=4a2<\/sup><\/p>\n

=> AC2<\/sup>=3a2<\/sup>=>BD’2<\/sup>=3a2<\/sup>. X\u00e9t tam gi\u00e1c BDD\u2019 c\u00f3:<\/p>\n

\"\"<\/p>\n

\"\"<\/p>\n

Ch\u1ecdn D<\/p>\n

B\u00e0i 19 (trang 34 sgk H\u00ecnh H\u1ecdc 12 n\u00e2ng cao):<\/b><\/p>\n

Khi \u0111\u1ed9 d\u00e0i c\u1ee7a h\u00ecnh l\u1eadp Ph\u01b0\u01a1ng t\u0103ng th\u00eam 2 cm th\u00ec th\u1ec3 t\u00edch c\u1ee7a n t\u0103ng th\u00eam 98 cm2<\/sup>. C\u1ea1nh c\u1ee7a h\u00ecnh l\u1eadp Ph\u01b0\u01a1ng \u0111\u00e3 cho l\u00e0:<\/p>\n

A. 4 cm \u00a0\u00a0\u00a0 B. 5 cm\u00a0\u00a0\u00a0C. 6 cm \u00a0\u00a0\u00a0D. 3 cm<\/p>\n

L\u1eddi gi\u1ea3i:<\/b><\/p>\n

G\u1ecdi a l\u00e0 c\u1ea1nh c\u1ee7a l\u1eadp ph\u01b0\u01a1ng H \u0111\u00e3 cho (a > 0) (\u0111\u01a1n v\u1ecb cm) th\u00ec c\u1ea1nh c\u1ee7a l\u1eadp ph\u01b0\u01a1ng H\u2019 l\u00e0 (a + 2) cm.<\/p>\n

Ta c\u00f3: VH’<\/sub>=(a+2)2<\/sup>,VH<\/sub>=a3<\/sup><\/p>\n

Theo gt: VH’<\/sub>-VH<\/sub>=98 <=> (a+2)3<\/sup>-a3<\/sup>=98<\/p>\n

\"\"<\/p>\n

Ch\u1ecdn D<\/p>\n

\n
<\/div>\n<\/div>\n
\n
\n

B\u00e0i 20 (trang 34 sgk H\u00ecnh H\u1ecdc 12 n\u00e2ng cao):<\/b><\/p>\n

Cho m\u1ed9t h\u00ecnh h\u1ed9p v\u1edbi s\u00e1u m\u1eb7t \u0111\u1ec1u l\u00e0 h\u00ecnh thoi c\u1ea1nh a g\u00f3c nh\u1ecdn b\u1eb1ng 60o<\/sup>. Khi \u0111\u00f3 th\u1ec3 t\u00edch c\u1ee7a h\u00ecnh h\u1ed9p l\u00e0:<\/p>\n

\"\"<\/p>\n

L\u1eddi gi\u1ea3i:<\/b><\/p>\n

\"\"<\/div>\n

X\u00e9t h\u00ecnh h\u1ed9p ABCD.A\u2019B\u2019C\u2019D\u2019 c\u00f3 c\u00e1c m\u1eb7t \u0111\u1ec1u l\u00e0 h\u00ecnh thoi c\u1ea1nh a g\u00f3c nh\u1ecdn l\u00e0 60o<\/sup>.<\/p>\n

Trong \u0394ABD, c\u00f3 g\u00f3c BAD=60o<\/sup>\u00a0(gt)<\/p>\n

V\u00e0 AB = AD (c\u00f9ng b\u1eb1ng a) n\u00ean \u0394ABC \u0111\u1ec1u c\u1ea1nh a.<\/p>\n

=> BD = a, t\u01b0\u01a1ng t\u1ef1 c\u00e1c h\u00ecnh \u0111\u01b0\u1eddng ch\u00e9o nh\u1ecf c\u1ee7a c\u00e1c m\u1eb7t h\u00ecnh h\u1ed9p \u0111\u1ec1u b\u1eb1ng a.<\/p>\n

=> A\u2019D = A\u2019B = BD = A\u2019A = AB = AD = a<\/p>\n

Hay A’.ABD l\u00e0 t\u1ee9 di\u1ec7n \u0111\u1ec1u c\u1ea1nh a nen \u0111\u01b0\u1eddng cao A’H=a \u221a6\/3<\/p>\n

\"\"<\/p>\n

Ch\u1ecdn B<\/p>\n

B\u00e0i 21 (trang 34 sgk H\u00ecnh H\u1ecdc 12 n\u00e2ng cao):<\/b><\/p>\n

Cho m\u1ed9t h\u00ecnh l\u1eadp Ph\u01b0\u01a1ng c\u00f3 c\u1ea1nh a, khi \u0111\u00f3 th\u1ec3 t\u00edch c\u1ee7a kh\u1ed1i m\u1eb7t \u0111\u1ec1u m\u00e0 c\u00e1c \u0111\u1ec9nh l\u00e0 trung \u0111i\u1ec3m c\u1ee7a c\u00e1c c\u1ea1nh kh\u1ed1i t\u1ee9 di\u1ec7n d cho l\u00e0:<\/p>\n

\"\"<\/p>\n

L\u1eddi gi\u1ea3i:<\/b><\/p>\n

Kh\u1ed1i 8 m\u1eb7t \u0111\u1ec1u \u0111\u1ec9nh l\u00e0 tam c\u1ee7a c\u00e1c m\u1eb7t c\u1ee7a l\u1eadp ph\u01b0\u01a1ng c\u1ea1nh a c\u00f3 c\u1ea1nh l\u00e0<\/p>\n

\"\"<\/p>\n

Ch\u1ecdn D<\/p>\n

\n
\n

B\u00e0i 22 (trang 34 sgk H\u00ecnh H\u1ecdc 12 n\u00e2ng cao):<\/b><\/p>\n

Cho kh\u1ed1i 12 m\u1eb7t \u0111\u1ec1u H c\u00f3 th\u1ec3 t\u00edch V v\u00e0 di\u1ec7n t\u00edch m\u1ed7i m\u1eb7t c\u1ee7a n\u00f3 b\u1eb1ng S. Khi \u0111\u00f3 t\u1ed5ng c\u00e1c kho\u1ea3ng c\u00e1ch t\u1eeb m\u1ed9t \u0111i\u1ec3m b\u00ean trong c\u1ee7a H \u0111\u1ebfn c\u00e1c m\u1eb7t c\u1ee7a n\u00f3 b\u1eb1ng.<\/p>\n

\"\"<\/p>\n

L\u1eddi gi\u1ea3i:<\/b><\/p>\n

Kh\u1ed1i 8 m\u1eb7t \u0111\u1ec1u m\u00e0 c\u00e1c \u0111\u1ec9nh l\u00e0 trung \u0111i\u1ec3m c\u1ee7a c\u00e1c c\u1ea1nh kh\u1ed1i t\u1ee9 di\u1ec7n \u0111\u1ec1u c\u1ea1nh a c\u00f3 \u0111\u1ed9 d\u00e0i m\u1ed7i c\u1ea1nh l\u00e0 a\/2<\/p>\n

\"\"<\/p>\n

Ch\u1ecdn A<\/p>\n

B\u00e0i 23 (trang 34 sgk H\u00ecnh H\u1ecdc 12 n\u00e2ng cao):<\/b><\/p>\n

Cho kh\u1ed1i 12 m\u1eb7t \u0111\u1ec1u H c\u00f3 th\u1ec3 t\u00edch V v\u00e0 di\u1ec7n t\u00edch c\u1ee7a m\u1ed7i m\u1eb7t c\u1ee7a n\u00f3 b\u1eb1ng S. Khi \u0111\u00f3 t\u1ed5ng c\u00e1c kho\u1ea3ng c\u00e1ch t\u1eeb m\u1ed9t \u0111i\u1ec3m b\u00ean trong cua H \u0111\u1ebfn c\u00e1c m\u1eb7t c\u1ee7a n\u00f3 l\u00e0:<\/p>\n

\"\"<\/p>\n

L\u1eddi gi\u1ea3i:<\/b><\/p>\n

Chia kh\u1ed1i 12 m\u1eb7t \u0111\u1ec1u H th\u00e0nh 12 h\u00ecnh ch\u00f3p tam gi\u00e1c c\u00f3 \u0111\u1ec9nh l\u00e0 M, b\u00ean trong H \u0111\u00e1y l\u00e0 1 m\u1eb7t c\u1ee7a H.<\/p>\n

G\u1ecdi V1<\/sub>,V2<\/sub>,V3<\/sub>,\u2026V12<\/sub>\u00a0th\u1ec3 t\u00edch c\u1ee7a 12 h\u00ecnh ch\u00f3p tam gi\u00e1c \u0111\u1ec1u tr\u00ean, h1<\/sub>,h2<\/sub>,\u2026h12<\/sub>\u00a0l\u00e0 chi\u1ec1u cao c\u1ee7a ch\u00fang (kho\u1ea3ng c\u00e1ch t\u1eeb M \u0111\u1ebfn c\u00e1c m\u1eb7t).<\/p>\n

Ta c\u00f3:<\/p>\n

\"\"<\/p>\n

Ch\u1ecdn C<\/p>\n

B\u00e0i 24 (trang 35 sgk H\u00ecnh H\u1ecdc 12 n\u00e2ng cao):<\/b><\/p>\n

M\u1ed9t kh\u1ed1i l\u0103ng tr\u1ee5 c\u00f3 c\u00e1c c\u1ea1nh \u0111\u00e1y b\u1eb1ng 19, 20, 37, \u0111\u01b0\u1eddng cao c\u1ee7a kh\u1ed1i alwng tr\u1ee5 b\u1eb1ng trung b\u00ecnh c\u1ed9ng c\u1ee7a c\u00e1c c\u1ea1nh \u0111ay. Khi \u0111\u00f3 th\u1ec3 t\u00edch c\u1ee7a kh\u1ed1i l\u0103ng tr\u1ee5 l\u00e0:<\/p>\n

A. 2888 \u00a0\u00a0\u00a0B. 125 \u221a(23<\/sup>\u00a0)\u00a0\u00a0\u00a0C. 1123\u00a0\u00a0\u00a0D. 4273<\/p>\n

L\u1eddi gi\u1ea3i:<\/b><\/p>\n

\"\"<\/p>\n

Ch\u1ecdn A<\/p>\n

B\u00e0i 25 (trang 35 sgk H\u00ecnh H\u1ecdc 12 n\u00e2ng cao):<\/b><\/p>\n

\u0110\u00e1y c\u1ee7a m\u1ed9t h\u00ecnh h\u1ed9p l\u00e0 m\u1ed9t h\u00ecnh thoi c\u00f3 c\u1ea1nh b\u1eb1ng 6 cm v\u00e0 g\u00f3c nh\u1ecdn b\u1eb1ng 45o<\/sup>, c\u1ea1nh b\u00ean h\u00ecnh h\u1ed9p d\u00e0i 10 cm, t\u1ea1o v\u1edbi m\u1eb7t ph\u1eb3ng \u0111\u00e1y m\u1ed9t g\u00f3c 45o<\/sup>. Ki \u0111\u00f3 th\u1ec3 t\u00edch c\u1ee7a h\u00ecnh h\u1ed9p l\u00e0:<\/p>\n

A. 124 \u221a3 cm3<\/sup>\u00a0\u00a0\u00a0B. 180 cm3<\/sup>\u00a0\u00a0\u00a0C. 120 \u221a2 cm3<\/sup>\u00a0\u00a0\u00a0D. 18 \u221a3 cm3<\/sup><\/p>\n

L\u1eddi gi\u1ea3i:<\/b><\/p>\n

S\u0111\u00e1y<\/sub>=62<\/sup>sin\u206145o<\/sup>=36\u221a2\/2 cm2<\/sup><\/p>\n

h=10.sin45o<\/sup>=5 \u221a2 cm<\/p>\n

=>V=S.h=180 cm3<\/sup>.<\/p>\n

Ch\u1ecdn B<\/p>\n

\n
\n

B\u00e0i 26 (trang 35 sgk H\u00ecnh H\u1ecdc 12 n\u00e2ng cao):<\/b><\/p>\n

V\u1edbi m\u1ed9t t\u1ea5m b\u00eca h\u00ecnh vu\u00f4ng, ng\u01b0\u1eddi ta c\u1eaft b\u1ecf \u1edf m\u1ed7i g\u00f3c t\u1ea5m b\u00eca m\u1ed9t h\u00ecnh vu\u00f4ng 12 cm r\u1ed3i g\u1ea5p l\u1ea1i th\u00e0nh m\u1ed9t h\u00ecnh ch\u1eef nh\u1eadt kh\u00f4ng c\u00f3 n\u1eafp. N\u1ebfu th\u1ec3 t\u00edch c\u00e1c h\u1ed9p l\u00e0 4800 cm3<\/sup>\u00a0th\u00ec c\u1ea1nh t\u1ea5m b\u00eca c\u00f3 \u0111\u1ed9 d\u00e0i l\u00e0:<\/p>\n

A. 42 cm\u00a0\u00a0\u00a0B. 36 cm\u00a0\u00a0\u00a0C. 44 cm\u00a0\u00a0\u00a0D. 38 cm<\/p>\n

L\u1eddi gi\u1ea3i:<\/b><\/p>\n

\"\"<\/p>\n

Kh\u1ed1i \u0111\u00f3 c\u00f3 c\u00e1c k\u00edch th\u01b0\u1edbc l\u00e0: (a-24),(a-24),12 cm (v\u1edbi a l\u00e0 \u0111\u1ed9 d\u00e0i t\u1ea5m b\u00eca)<\/p>\n

V = 12. (a-24)2<\/sup>\u00a0<=> 4800 = 12.(a-24)2<\/sup><\/p>\n

<=> a = 44.<\/p>\n

Ch\u1ecdn C<\/p>\n

B\u00e0i 27 (trang 35 sgk H\u00ecnh H\u1ecdc 12 n\u00e2ng cao):<\/b><\/p>\n

Cho m\u1ed9t h\u00ecnh ch\u00f3p tam gi\u00e1c \u0111\u1ec1u c\u00f3 c\u1ea1nh \u0111\u00e1y b\u1eb1ng a v\u00e0 c\u1ea1nh b\u00ean t\u1ea1o v\u1edbi m\u1eb7t ph\u1eb3ng \u0111\u00e1y m\u1ed9t g\u00f3c \u03b1. Th\u1ec3 t\u00edch c\u1ee7a h\u00ecnh ch\u00f3p \u0111\u00f3 l\u00e0:<\/p>\n

\"\"<\/p>\n

L\u1eddi gi\u1ea3i:<\/b><\/p>\n

Ch\u1ecdn B<\/p>\n

\"\"<\/p>\n

X\u00e9t ch\u00f3p tam gi\u00e1c \u0111\u1ec1u S.ABC g\u1ecdi H l\u00e0 h\u00ecnh chi\u1ebfu c\u1ee7a S tr\u00ean (ABC)<\/p>\n

\"\"<\/p>\n<\/div>\n<\/div>\n

\n
\n

B\u00e0i 28 (trang 35 sgk H\u00ecnh H\u1ecdc 12 n\u00e2ng cao):<\/b><\/p>\n

M\u1ed9t h\u00ecnh ch\u00f3p tam gi\u00e1c \u0111\u1ec1u c\u00f3 c\u1ea1nh b\u00ean b\u1eb1ng b v\u00e0 c\u1ea1nh b\u00ean t\u1ea1o v\u1edbi m\u1eb7t ph\u1eb3ng \u0111\u00e1y m\u1ed9t g\u00f3c \u03b1. Th\u1ec3 t\u00edch c\u1ee7a h\u00ecnh ch\u00f3p \u0111\u00f3 l\u00e0:<\/p>\n

\"\"<\/p>\n

L\u1eddi gi\u1ea3i:<\/b><\/p>\n

Ch\u1ecdn B<\/p>\n<\/div>\n<\/div>\n

\n
\n

B\u00e0i 29 (trang 36 sgk H\u00ecnh H\u1ecdc 12 n\u00e2ng cao):<\/b><\/p>\n

Cho m\u1ed9t h\u00ecnh ch\u00f3p t\u1ee9 gi\u00e1c \u0111\u1ec1u H c\u00f3 di\u1ec7n t\u00edch \u0111\u00e1y b\u1eb1ng 4 v\u00e0 di\u1ec7n t\u00edch c\u1ee7a m\u1ed9t m\u1eb7t b\u00ean b\u1eb1ng \u221a2. Th\u1ec3 t\u00edch c\u1ee7a H l\u00e0:<\/p>\n

\"\"<\/p>\n

L\u1eddi gi\u1ea3i:<\/b><\/p>\n

\"\"<\/p>\n

G\u1ecdi a l\u00e0 \u0111\u1ed9 d\u00e0i c\u1ea1nh \u0111\u00e1y => 4 = a3<\/sup>=>a=2<\/p>\n

O l\u00e0 h\u00ecnh chi\u1ebfu c\u1ee7a S tr\u00ean (ABCD)<\/p>\n

=> O l\u00e0 t\u00e2m c\u1ee7a \u0111\u00e1y<\/p>\n

\"\"<\/p>\n

Ch\u1ecdn \u0111\u00e1p \u00e1n C<\/p>\n<\/div>\n<\/div>\n

B\u00e0i 30 (trang 36 sgk H\u00ecnh H\u1ecdc 12 n\u00e2ng cao):<\/b><\/p>\n

M\u1ed9t kh\u1ed1i ch\u1ed1p tam gi\u00e1c c\u00f3 c\u00e1c c\u1ea1nh \u0111\u00e1y b\u1eb1ng 6, 8, 10. C\u1ea1nh b\u00ean c\u00f3 \u0111\u1ed9 d\u00e0i l\u00e0 4 v\u00e0 t\u1ea1o v\u1edbi \u0111\u00e1y m\u1ed9t g\u00f3c 60o<\/sup>. Th\u1ec3 t\u00edch c\u1ee7a kh\u1ed1i ch\u00f3p \u0111\u00f3 l\u00e0:<\/p>\n

\"\"<\/p>\n

L\u1eddi gi\u1ea3i:<\/b><\/p>\n

\"\"<\/p>\n

Ch\u1ecdn A<\/p>\n

\n
\n

B\u00e0i 31 (trang 36 sgk H\u00ecnh H\u1ecdc 12 n\u00e2ng cao):<\/b><\/p>\n

N\u1ebfu m\u1ed9t h\u00ecnh ch\u00f3p \u0111\u1ec1u c\u00f3 chi\u1ec1u cao v\u00e0 c\u1ea1nh \u0111\u00e1y c\u00f9ng t\u0103ng l\u00ean n l\u1ea7n th\u00ec th\u1ec3 t\u00edch c\u1ee7a n\u00f3 t\u0103ng l\u00ean:<\/p>\n

A. n2<\/sup>\u00a0l\u1ea7n\u00a0\u00a0\u00a0B. 2n2<\/sup>\u00a0l\u1ea7n\u00a0\u00a0\u00a0C. n3<\/sup>\u00a0l\u1ea7n\u00a0\u00a0\u00a0D. 2n3<\/sup>\u00a0l\u1ea7n<\/p>\n

L\u1eddi gi\u1ea3i:<\/b><\/p>\n

\"\"<\/p>\n

Khi m\u1ed7i c\u1ea1nh t\u0103ng l\u00ean n l\u1ea7n th\u00ec S\u0111\u00e1y<\/sub>\u00a0t\u0103ng l\u00ean n2<\/sup>\u00a0l\u1ea7n m\u00e0 h t\u0103ng n l\u1ea7m. v\u1eady V t\u0103ng n3<\/sup>\u00a0l\u1ea7n. ch\u1ecdn C<\/p>\n

B\u00e0i 32 (trang 36 sgk H\u00ecnh H\u1ecdc 12 n\u00e2ng cao):<\/b><\/p>\n

Khi chi\u1ec1u cao c\u1ee7a m\u1ed9t h\u00ecnh ch\u00f3p \u0111\u1ec1u t\u0103ng l\u00ean n l\u1ea7n, nh\u01b0ng m\u1ed7i c\u1ea1nh \u0111\u00e1y gi\u1ea3m \u0111i n l\u1ea7n th\u00ec th\u1ec3 t\u00edch c\u1ee7a n\u00f3 l\u00e0:<\/p>\n

A. Kh\u00f4ng thay \u0111\u1ed5i<\/p>\n

B. T\u0103ng l\u00ean n l\u1ea7n<\/p>\n

C. T\u0103ng l\u00ean (n \u2013 1) l\u1ea7n<\/p>\n

D. Gi\u1ea3m \u0111i n l\u1ea7n<\/p>\n

L\u1eddi gi\u1ea3i:<\/b><\/p>\n

Khi m\u1ed7i c\u1ea1nh gi\u1ea3m n l\u1ea7n th\u00ec S\u0111\u00e1y<\/sub>\u00a0gi\u1ea3m n2<\/sup>\u00a0l\u1ea7n m\u00e0 h t\u0103ng l\u00ean n l\u1ea7n. V\u1eady V gi\u1ea3m \u0111i n l\u1ea7n.<\/p>\n

Ch\u1ecdn D.<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n

\n
<\/div>\n<\/div>\n
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<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

B\u00e0i 1 (trang 31 sgk H\u00ecnh H\u1ecdc 12 n\u00e2ng cao): M\u1ed7i \u0111\u1ec9nh c\u1ee7a h\u00ecnh \u0111a di\u1ec7n l\u00e0 \u0111\u1ec9nh chung c\u1ee7a \u00edt nh\u1ea5t: A. M\u1ed9t c\u1ea1nh\u00a0\u00a0\u00a0B. B\u1ed1n c\u1ea1nh\u00a0\u00a0\u00a0C. Ba c\u1ea1nh\u00a0\u00a0\u00a0D. Hai c\u1ea1nh L\u1eddi gi\u1ea3i: V\u00ec kh\u00f4ng c\u00f3 h\u00ecnh da di\u1ec7n n\u00e0o l\u00e0 m\u1ed7i \u0111\u1ec9nh l\u00e0 \u0111\u1ec9nh chung c\u1ee7a m\u1ed9t c\u1ea1nh. Ch\u1ecdn C B\u00e0i 2 (trang 31 […]<\/p>\n","protected":false},"author":3,"featured_media":22373,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_mi_skip_tracking":false,"tdm_status":"","tdm_grid_status":""},"categories":[1302],"tags":[1392,1393],"yoast_head":"\nH\u00ecnh h\u1ecdc - Ch\u01b0\u01a1ng 1 - \u00d4n t\u1eadp ch\u01b0\u01a1ng 1 - C\u00e2u h\u1ecfi tr\u1eafc nghi\u1ec7m<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/lop12.edu.vn\/hinh-hoc-chuong-1-on-tap-chuong-1-cau-hoi-trac-nghiem\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"H\u00ecnh h\u1ecdc - Ch\u01b0\u01a1ng 1 - \u00d4n t\u1eadp ch\u01b0\u01a1ng 1 - C\u00e2u h\u1ecfi tr\u1eafc nghi\u1ec7m\" \/>\n<meta property=\"og:description\" content=\"B\u00e0i 1 (trang 31 sgk H\u00ecnh H\u1ecdc 12 n\u00e2ng cao): M\u1ed7i \u0111\u1ec9nh c\u1ee7a h\u00ecnh \u0111a di\u1ec7n l\u00e0 \u0111\u1ec9nh chung c\u1ee7a \u00edt nh\u1ea5t: A. M\u1ed9t c\u1ea1nh\u00a0\u00a0\u00a0B. B\u1ed1n c\u1ea1nh\u00a0\u00a0\u00a0C. Ba c\u1ea1nh\u00a0\u00a0\u00a0D. Hai c\u1ea1nh L\u1eddi gi\u1ea3i: V\u00ec kh\u00f4ng c\u00f3 h\u00ecnh da di\u1ec7n n\u00e0o l\u00e0 m\u1ed7i \u0111\u1ec9nh l\u00e0 \u0111\u1ec9nh chung c\u1ee7a m\u1ed9t c\u1ea1nh. 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