Cho hình chóp S. ABCD có tất cả các cạnh bên và cạnh đáy đều bằng a và ABCD là hình vuông. Gọi M là trung điểm của CD. Giá trị M S → . C B → bằng

A.  a 2 2

B.  - a 2 2

C.  a 2 3

D.  2 a 2 2  

Mark the letter A, B, C, or D on your answer sheet to indicate the sentence that best combines each pair of sentences in the following questions.

The agreement ended six-month negotiation. It was signed yesterday

A. The agreement which was signed yesterday lasted six-month.

B. The agreement which was signed yesterday ended six-month negotiation.

C. The agreement which ends six-month negotiation was signed yesterday.

D. The agreement which lasted six-month was signed yesterday.

Cho hình chóp S. ABCD có đáy ABCD là hình vuông cạnh a, cạnh bên SA vuông góc với mặt đáy và S A = a 2 . Tìm số đo của góc giữa đường thẳng SC và mặt phẳng (SAB)

A.  45 °

B.  30 °

C.  90 °

D.  60 °  

Mark the letter A, B, C, or D on your answer sheet to indicate the sentence that best combines each pair of sentences in the following questions.

You usually drive fast. You use more petrol than usual

A. The faster you drive, the more you use petrol.

B. The more you drive fast, the more you use petrol.

C. The faster you drive, the more petrol you use.

D. The more fast you drive, the more petrol you use.