What is the Radius? If

If the surface area of a sphere is 346.5 cm square, then is radius [ taking p = 22/7 ] is

  1. 7 cm
  2. 3.25 cm
  3. 5.25 cm
  4. 9 cm
Anurag Mishra Professor Asked on 16th July 2015 in Maths.
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1 Answer(s)

Answer: (3) 5.25 cm
Explanation:-
Formula-
The surface area of the sphere = 4 x pai x r2According to the question,
4 x pai x r2 = 346.5
r2 = 346.5/4 x pai
r2 = 346.5 x 7 /22 x 4                           ( pai = 22/7 )
r2 = 27.56
Square root on both side,
r = 5.25 cm
Hence, the answer is (3) 5.25 cm.

Anurag Mishra Professor Answered on 16th July 2015.
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