Cho hình chóp tứ giác đều S.ABCD có AB = a, . Gọi G là trọng tâm tam giác SCD. Góc giữa đường thẳng BG với mặt phẳng (ABCD) bằng:

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Một số câu hỏi khác có thể bạn quan tâm.

• Choose the correct sentence which is built from the words and phrases given:

  it / in / that / every / estimated / of / American / 2003 / 1.31 / tons / was / generated / garbage
  
  

• Choose the best answer for the following sentence:

  Last year I went to a party alone. I didn't know any people there except the host. I felt very ______________.
   

• Choose the correct sentence which is built from the words and phrases given:

  site / environmentalists / many / highest / Mount Everest / is / think / the / world’s / garbage
  
  

• Choose the best answer for the following sentence:

  He entered the class, sat on the second row and _____________ at the girl sitting next to him.
   

• Choose the correct sentence which is built from the words and phrases given:

  bags / than / two / buried / tons / of / paper / more / old / plastic / clothes / had / been / tents / burned / and / or
  
  

• Choose the correct sentence which is built from the words and phrases given:

  plastic / three / of / bottles / tent / tons / aluminum / poles / ladders / oxygen /
  empty / and / cans / also / cleared / were
  
  

• Choose the best answer for the following sentence:

  The businessmen __________ many things in the fire.
   

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

  Only the manager knows the details of the project.
  
  

• Choose the best answer for the following sentence:

  Can you write an article telling about one of your most memorable past ___________?
   

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

  She has no intention to give up her hobby.