Then Its Volume Is;

The height of a right circular cylinder is 21 cm. 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
Monis Rasool Professor Asked on 25th July 2015 in Maths.
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1 Answer(s)

Answer: (3). 3234 cu. Cm

Given: Height of right circular cylinder is 21 cm.

C.S.A of cylinder is 924 sq. cm.

C.S.A of cylinder = 2πRH

2πRH = 924

R = (924×7) ÷ (2x22x21)

R = 6468 ÷ 924

R = 7 cm.

Now, we have to find Vol. of cylinder

Vol. of cylinder = πR2H

Vol. of cylinder = (22x7x7x21) ÷7

Vol. of cylinder = 3234 cu. Cm.

 

vijay Professor Answered on 25th July 2015.
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