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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