Cho hình thang ABCD có \(A = B = 90^\circ ,AD = 2AB = 2BC = 2\). Tính thể tích khối tròn xoay sinh ra khi quay hình thang ABCD xung quanh trục CD.

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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:

  She studies hard and gets on well with her classmates.

   

   

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

  The last time I visited the museum was a year ago.

   

   

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

  when / Mary / my / we / were / friend / used / she / to / help / is / me / with 

  / best / homework / at / who / school

   

• Choose a word that has different stress pattern:

  nervous             wonsder              belong                quiet

• Choose a word that has different stress pattern:

  uncomfortable             conversation             embarrassing           experience

• Choose the word that has the underlined part pronounced differently from the rest:

  passed             treated            hoped              noticed

• Choose the best answer for the following sentence:

  I have invited some friends to our house for _____________________________ dinner.

• Choose the best answer for the following sentence:

  My most ___________________________ moment was trying to introduce a woman whose name I couldn't remember.

• Choose the best answer for the following sentence:

  She ______________________ to get her breath back and then carried on jogging.

    

• Choose the best answer for the following sentence:

  The more they tried to get her to talk about her experiences, the further she

  retreated back into her __________________________ .