Question

Total surface area of a hemisphere is 12pie . find its radius.​

Answer 1

Step-by-step explanation:

TSA of hemisphere =

$3\pi {r}^{2}$

But it is given that it's TSA is

$12\pi$

so,

$12\pi = 3\pi {r}^{2} \\ 4\pi = \pi {r}^{2} \\ 4 = {r}^{2} \\ now \: r = \sqrt{4} \\ therefore \: radius = 2m$

Hope it helps____________ ;)

Answer 2

t.s.a of hemisphere =3πrsq.

12π=3πr sq

r sq=12π/3π

r sq=4

r=2