Question

the ratio of the whole surfacearea of solid sphere and solid hemisphere is

Answer 1

TSA of sphere = 4πr²
TSA of hemisphere = 3πr²

TSA of sphere / TSA of hemisphere = 4/3 = 4:3

Answer 2

surface area of sphere=4× pi× r^2
surface area of solid hemisphere=3×pi×r^2
ratio=4×pi ×r^2/3×pi×r^2
=4/3=4:3
hence, required ratio is 4:3