Cho hình nón có bán kính $R=2$ và độ dài đường sinh $l=6\sqrt{3}$ . Khi đó diện tích xung quanh của hình nón là

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Một số câu hỏi khác có thể bạn quan tâm.

• Choose a word that has different stress pattern:

  development                 security                 pessimistic                 particular

• Choose a word that has different stress pattern:

  threaten               appear                 modern                 instance

• Choose a word that has different stress pattern:

  experience              technology                environment                  optimistic

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

  Vietnam / an average growth in GDP / 7.1% per year / 2000 to 2004.
  
  

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

  The GDP growth / 8.4% / 2005 / the second largest growth in Asia, after only China.
  
  

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

   November 7, 2006 / Vietnam became WTO’s 150^th member / after several years of preparation and negotiation.
  
  

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

  Government figures / GDP growth / 8.17% / 2006.
  
  

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

  Vietnam’s Minister of Planning and Investment / the government / target / a GDP growth of around 8.5% / 2007.
  
  

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

  Imagine an entirely wireless world where the Net is "always on, always there", we live in endless sea of data, and objects are alive with intelligent.

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

  Electricity is the most critical energy for the future of many countries and cheap, plentiful electricity is associated for high employment and productivity.