Cho hình lập phương có cạnh bằng . Một hình nón có đỉnh là tâm hình vuông và có đường tròn đáy ngoại tiếp hình vuông . Gọi là diện tích xung quanh của hình nón đó. Tính .  

Chia sẻ

Một số câu hỏi khác có thể bạn quan tâm.

• Choose the best answer for the following sentence:

  As all field players are only allowed to touch the ball with one hand at a time, they must develop the ability to catch and ____________ the ball with either hand.

   

• Choose the best answer for the following sentence:

  ________________ is the activity of swimming underwater using special breathing equipment.

   

• Choose the best answer for the following sentence:

  When the offense takes possession of the ball, the strategy is to _____________ the ball down the field of play and to score a goal.

   

• Choose the best answer for the following sentence:

  The referee signals with a whistle and by lowering his arm, and the player taking the penalty ___________ must immediately throw the ball with an uninter-rupted motion toward the goal.

   

• Choose the best answer for the following sentence:

  Some of the students began to fall asleep _____________ the lecture was boring and irrelevant.

   

• Choose the best answer for the following sentence:

  ____________________ , I do not consider this composition acceptable.

   

• Choose the best answer for the following sentence:

   The burglar _____________________.

   

• Choose the best answer for the following sentence:

  Our teacher ___________________ to take the exam.

   

• Choose the best answer for the following sentence:

  If Charlie _______________, he could have been injured.

   

• Choose the best answer for the following sentence:

  The turtle __________________ of Arizona.