Question

Surface area of hemisphere is 308cm² the find it's radius

Answer 1

Answer:

Step-by-step explanation:

surface area of hemisphere=2πr²

⇒308=2πr²

⇒πr²=154

⇒r²=49

⇒r=7

hence,radius of hemisphere=7cm.

Answer 2

$Total \: surface \: area \: of \: hemisphere = 3 \times \frac{22}{7} \times {r}^{2} \\ 308 = 3 \times \frac{22}{7} \times {r}^{2} \\ r = \sqrt{ \frac{308 \times 7}{3 \times 22} } \\ r = \sqrt{ \frac{2153}{66} } \\ r = 5.71149 \: cm$