Question

find the ratio of total surface area of a sphere and a solid hemisphere of same same radius

Answer 1

T.S.A of a sphere =
$4\pi {r}^{2}$
T.S.A of hemisphere =
$3\pi {r}^{2}$
$\frac{4\pi {r}^{2} }{3\pi {r }^{2} } = \frac{4}{3} =$
4:3

Answer 2

Hey mate !
________

The solution is in the attachment.

Hope it helps !