Cắt một hình nón N bằng một mặt phẳng đi qua trục của nó ta được thiết diện là một tam giác vuông có cạnh huyền bằng a . Tính diện tích xung quanh Sxq của hình nón đó.           

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Một số câu hỏi khác có thể bạn quan tâm.

• Mark the letter A, B, C or D on your answer sheet to indicate the sentences that best combines each pair of sentences in the following questions:

  She wrote the text. She selected the illustration as well.         

• Mark the letter A, B, C or D on your answer sheet to indicate the sentences that best combines each pair of sentences in the following questions:

  The plan may be ingenious. It will never work in practice.         

• Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions:

  Vietnam exports a lot of rice. It is grown mainly in the south of the country.         

• Mark the letter A, B, C, or D on your answer sheet to indicate the sentence that best combines each pair of sentences in the following questions:

  Marry loved her stuffed animal when she was young. She couldn’t sleep without it.         

• Mark the letter A, B, C, or D on your answer sheet to indicate the sentence that best combines each pair of sentences in the following questions:

  The fire-fighters made every effort to put off the flames. The building burned down completely.             

• Mark the letter A, B, C, or D on your answer sheet to indicate the sentence that best combines each pair of sentences in the following questions:

  It doesn’t make any difference if it rain. They will still go.         

• Mark the letter A, B, C, or D on your answer sheet to indicate the sentence that best combines each pair of sentences in the following questions:

  The plan may be ingenious. It will never work in practice.             

• Mark the letter A, B, C, or D on your answer sheet to indicate the sentence that is closest in meaning to each of the following sentences.

  The coffee was not strong. It didn’t keep us awake.         

• Mark the letter A, B, C, or D on your answer sheet to indicate the sentence that best combines each pair of sentences in the following questions

  We can protect the world in which we live. We, for example, can grow more trees and recycle rubbish.         

• Mark the letter A, B, C or D on your answer sheet to indicate the sentence that best combines each pair of sentences in  the following questions:

  Mary was sick. She didn’t leave the meeting until it ended.