Cho hình lăng trụ đứng  có , . Gọi  là trung điểm của . Tính sin của góc giữa mặt phẳng  và mặt phẳng .

Chia sẻ

Một số câu hỏi khác có thể bạn quan tâm.

• Find a mistake in the four underlined parts of the sentence and correct it:

  The storm N°9, for which we are waiting, have changed its direction.

• Find a mistake in the four underlined parts of the sentence and correct it:

  The man with whom my sister is married is a doctor.

• Choose the best answer for the following sentence:

  Her friends suggested that Mary _____________ a buffet for her birthday party.

   

• Choose the best answer for the following sentence:

  Working here requires employees _____________ good at English and computer

   

• Find a mistake in the four underlined parts of the sentence and correct it:

  The work of which she is fed up is to look after the children.

• Find a mistake in the four underlined parts of the sentence and correct it:

  The woman by whom he was brought about was very kind to him.

• Choose one sentence that has the same meaning as the root one:

  The music was composed by Trinh Cong Son. We enjoy listening to it.
  
  

• Choose one sentence that has the same meaning as the root one:

  The work is well- paid. He wants to apply for it.
  
  

• Choose one sentence that has the same meaning as the root one:

  The flat is on the second floor. He lives in the flat.
  
  

• Choose one sentence that has the same meaning as the root one:

  ''You had better not cross the forest at night,'' Peter said.