Hỏi đáp về Ôn tập cuối năm - Hình học 12

A. \(5.\)                             B. \(2.\)

C. \(6.\)                             D. \(4.\)

A. \(6\sqrt 3 \pi {a^2}.\)   B. \(12\sqrt 3 \pi {a^2}.\)

C. \(4\sqrt 3 \pi {a^2}.\)   D. \(24\sqrt 3 \pi {a^2}.\)

A. \(2,4m.\)                          B. \(2,3m.\)

C. \(2,6m.\)                          D. \(2,5m.\)

A. \(90^\circ .\)                   B. \(30^\circ .\)

C. \(45^\circ .\)                   D. \(60^\circ .\)

A. \(3\sqrt 3 a.\)                  B. \(3a.\)

C. \(a.\)                                  D. \(6a.\)

A. \(54\sqrt 3 {a^3}.\)       B. \(108\sqrt 3 {a^3}.\)

C. \(27\sqrt 3 {a^3}.\)      D. \(18\sqrt 3 {a^3}.\)

A. \(80\pi {a^2}.\)             

B. \(160\pi {a^2}.\)

C. \(16\pi \sqrt 7 {a^2}.\) 

D. \(40\pi {a^2}.\)

A. \(\dfrac{3}{4}.\)           B. \(\dfrac{1}{2}.\) 

C. \(\dfrac{3}{5}.\)           D. \(\dfrac{2}{3}.\)

A. \(3a\sqrt 2 .\)                  B. \(2a\sqrt 2 .\)

C. \(a\sqrt 2 .\)                     D. \(2a.\)

A. \(72\pi {a^2}.\)             B. \(12\pi {a^2}.\) 

C. \(36\pi {a^2}.\)             D. \(9\pi {a^2}.\)

A. \(2{a^3}.\)                      B. \(2\sqrt 2 {a^3}.\)

C. \(3{a^3}.\)                      D. \(3\sqrt 2 {a^3}.\)

A. \(12\pi {a^2}.\)             

B. \(6\pi {a^2}.\)

C. \(36\pi {a^2}.\)             

D. \(9\pi {a^2}.\)

A. \(3a.\)                               

B. \(6a.\)

C. \(9a.\)                               

D. \(27a.\)

A. \(\left\{ {4;3} \right\}\) và \(\left\{ {3;3} \right\}.\)

B. \(\left\{ {4;3} \right\}\) và \(\left\{ {3;5} \right\}.\)

C. \(\left\{ {4;3} \right\}\) và \(\left\{ {3;4} \right\}.\)

D. \(\left\{ {3;4} \right\}\) và \(\left\{ {4;3} \right\}.\)

A. 6                                        

B. 12                                       

C. 4                                        

D. 8

A. \(S = \dfrac{{{a^2}\sqrt 3 }}{4}\)                                   

B. \(S = \dfrac{{{a^2}}}{2}\) 

C. \(S = \dfrac{{{a^2}\sqrt 3 }}{2}\) 

D. \(S = \dfrac{{{a^2}}}{4}\)

A. \(V = \dfrac{{2{a^3}\sqrt 3}}{3}\)                                

B. \(V = \dfrac{{{a^3}\sqrt 3 }}{3}\)

C. \(V = {a^3}\sqrt 3 \)         

D. \(V = 2{a^3}\sqrt 3 \)

A. \(S = {a^2}\)                      

B. \(S = 2{a^2}\)                   

C. \(S = \dfrac{{{a^2}\sqrt 3 }}{4}\) 

D. \(S = {a^2}\sqrt 3 \)

A. 0                                        

B. 1                                         

C. 2                                        

D. 4

A. 8                                        

B. 4                                         

C. 12                                      

D. 6

A. \(V = \dfrac{{125\pi {a^3}}}{{27}}\)                              

B. \(V = \dfrac{{25\sqrt 3 \pi {a^3}}}{3}\)

 C. \(V = \dfrac{{25\sqrt 2 \pi {a^3}}}{3}\) 

D. \(V = \dfrac{{125\sqrt 3 \pi {a^3}}}{{54}}\)

A. \(r = \sqrt 2 a\)      

B. \(r = 2\sqrt 3 a\)    

C. \(r = \sqrt 3 a\)      

D. \(r = 2\sqrt 2 a\)

A. Hình hộp chữ nhật             

B. Hình nón                            

C. Hình lăng trụ đứng            

D. Hình trụ

A. \(4\pi {a^2}\)                      

B. \(12\pi {a^2}\)                    

C. \(20\pi {a^2}\)                    

D. \(8\pi {a^2}\)