Question :

The radius of a spherical balloon is inflated from 1.5 c m to 2.5 c m by pumping more air in it. Find the ratio of surface area of resulting balloon to the original balloon.
Submitted on 30/10/2024 | Answered by Vandana Rana

Answer :

Surface area of sphere=4πr²
S1=4π(1.5)²
S2=4π(2.5)²

Ratio of S1 and S2 S1/S2=(1.5×1.5)/(2.5×2.5)
=( 3×3)/(5×5)
=9/25