What is volume?

The height of a right circular cylinder is 21cm. Its curved surface area is 924 sq cm. Then its volume is:

  1. 1859 cu. cm
  2. 1586 cu. cm
  3. 3234 cu. cm
  4. None of these
Anurag Mishra Professor Asked on 7th January 2016 in Maths.
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  • 1 Answer(s)

    Answer: (4) None of these

    Explanation:-
    Let the radius of the right circular cylinder be R.

    Formula-
    The surface area of right circular cylinder = 2 π r h 

    Then, 2 x 22 x 21 x R/7 = 924
    R = 924 x 7/44 x 21
    R = 21 x 7/21
    R = 7

    Then, the volume of the right circular cylinder = 2 x 22 x 7 x 7 x 21/7
    = 44 x 147
    = 6468 cm. cm

    Hence, the correct answer is option (4) None of these.

    Anurag Mishra Professor Answered on 8th January 2016.
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