Find the volume of a sphere whose surface area is 154 cm2. (Assume π = 22/7)

 Solution:

Let r be the radius of a sphere.

Surface area of sphere = 4πr2

4πr2 = 154 cm2 (given)

r2 = (154×7)/(4 ×22)

r = 7/2

Radius is 7/2 cm

Now,

Volume of the sphere = (4/3) πr3