Question

ratio of the whole surface area of a solid sphere and a solid hemisphere is dash

Answer 1

TSA of sphere =
$4\pi {r}^{2}$
TSA of hemisphere=
$3\pi {r}^{2}$
Ratio=
$\frac{4\pi {r}^{2} }{3\pi {r}^{2} }$
= 4:3