Cho hình chóp S.ABCD đáy ABCD là hình chữ nhật; . Hình chiếu của S lên mặt phẳng  là trung điểm H của AB; SC tạo với đáy góc . Khoảng cách từ A đến mặt phẳng  là ?           

Chia sẻ

Một số câu hỏi khác có thể bạn quan tâm.

• Choose the best answer for the following sentence:

  We wanted to see the action, but they made us get __________ .
   

• Choose the best answer for the following sentence:

  He left that job because the boss always kicked him _________ .
   

• Choose the best answer for the following sentence:

  She was a good mother; she did well ____________ her children.
   

• Choose the best answer for the following sentence:

  Don't take him ___________ a fool; he is really quite smart.
   

• Choose the best answer for the following sentence:

  If you are looking for volunteers, count me _________.
   

• Choose the best answer for the following sentence:

  He wrote __________ his sister when she got into trouble.
   

• Choose the word that has the underlined part pronounced differently from the rest:

  advocate                pioneer                  involvement                  philosopher

• Choose the word that has the underlined part pronounced differently from the rest:

  rubbish                  struggle                   tsunami                sculpture

• Choose the word that has the underlined part pronounced differently from the rest:

  civilization                              intellectual                                epidemic                                     discriminate

• Choose the word that has the underlined part pronounced differently from the rest:

  childbearing                    deep-seated                   childrearing                  clear