Bạn Khang mua một chiếc phao bơi và bơm căng lên (đó là một mặt xuyến sinh bởi đường tròn bán kính đồng phẳng với trục và có tâm cách trục 40cm). Hãy tính thể tích gần đúng nhất của chiếc phao (theo đơn vị ).  

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Một số câu hỏi khác có thể bạn quan tâm.

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

  Don’t bother to lock the door.
  
  

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

  I’m afraid I won’t be able to do the work in time.
  
  

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

  It’s very important to keep your passport in a safe place.
  
  

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

  The police shouldn’t allow people to park there.
  
  

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

  Visitors must leave umbrellas and sticks in the cloakroom.
  
  

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

  He can’t have used a calculator to do it.
  
  

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

  My grandfather’s health is improving.
  
  

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

  Nowadays many people are learning English.
  
  

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

  Mr. Brown works better when he’s pressed for time.
  
  

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

  As Mrs. Anderson gets older, she wants to travel less.