[tex]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[/tex] Reply

Answer: Step-by-step explanation: surface area of hemisphere=2πr² ⇒308=2πr² ⇒πr²=154 ⇒r²=49 ⇒r=7 hence,radius of hemisphere=7cm. Reply

[tex]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[/tex]

Answer:Step-by-step explanation:surface area of hemisphere=2πr²

⇒308=2πr²⇒πr²=154⇒r²=49⇒r=7hence,radius of hemisphere=7cm.