Cho hình lăng trụ đứng  có độ dài cạnh bên . Đáy  là tam giác vuông tại , biết . Tính sin của góc  là góc tạo bởi hai mặt phẳng  và .

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Một số câu hỏi khác có thể bạn quan tâm.

• Choose the best answer for the following sentence:

  The water in the lake must be ___________ before you use it.

   

• Choose the best answer for the following sentence:

  Most feminists object  to beauty contests in which contestants are in _____________ 

  swimsuits and ___________ high-heeled shoes.

   

• Choose the best answer for the following sentence:

  Beauty contests increased _________ most in _________ popularity in 1960.

    

• Choose the best answer for the following sentence:

  Beauty contests are very popular__________ teenagers in Venezuela.

   

• Choose the best answer for the following sentence:

  A beauty contest is a competition based largely ______________  the beauty of the

  contestants’ physical appearance.

   

• Choose the best answer for the following sentence:

  You have not participated __________ any of our competitions before, have you?

   

• Choose the best answer for the following sentence:

  _________ a contest requires a good preparation.

   

• Choose the best answer for the following sentence:

  She looked at me with admiration, ____________.

   

• Choose the best answer for the following sentence:

  _________ a winner in an eloquence, you must be very competent in public speaking.

   

• Choose the best answer for the following sentence:

  ______________ The semi-finals, he went on to play in the finals.