Cho hình nón tròn xoay đỉnh S, đáy là một hình tròn tâm O bán kính R, chiều cao của hình nón bằng 2R. Gọi I là một điểm nằm trên mặt phẳng đáy sao cho IO=2R. Gỉa sử A là điểm trên đường tròn (O) sao cho . Diện tích xung quanh của hình nón bằng:                           

Chia sẻ

Một số câu hỏi khác có thể bạn quan tâm.

• Choose a word that has different stress pattern:

  children                       subject                            certain                     divide

• Choose a word that has different stress pattern:

  disruptive                           primary                          secondary                          educate

• Choose a word that has different stress pattern:

  tragedy                             effective                               history                      nursery

• Choose a word that has different stress pattern:

  robot                       upper                        surprise                         infant

• Choose the best answer for the following sentence:

  It’s time we concentrated on our _____________ business.
  
  
  

• Choose the best answer for the following sentence:

  ______________ mortality rates are associated with many factors, including maternal realth, access to medical care, socio-economic conditions and public health practices.
  

• Choose the best answer for the following sentence:

  Few of them have made much ____________ in those branches of industry which give a variety and complexity to the affairs of a nation.
   

• Choose the best answer for the following sentence:

  They are conducting a campaign to ___________ the public about the dangers of smoking.
   

• Choose the best answer for the following sentence:

  The stores are __________ specials on sweaters this weekend.
   

• Choose the best answer for the following sentence:

  Schools' systems may also lead them to report scholarships in the calendar year of the __________ term.