Find the volume of a sphere whose surface area is 154 cm2.
Solution:
Surface area of sphere = 4 π r2
Or, 154 = 4 X (22/7) X r2
Or, r2 = (154 X 7)/(22 X 4) = 49/4
Or, r = 7/2 = 3.5 cm
Volume of sphere = 4/3 π r3
= (4/3) X (22/7) X (3.5)3 = 179.67 cubic cm
