Question

If sphere is cut into two hemisphere whose total surface area is 90cm^2
then what is surface area of the sphere​

Answer 1

Answer:

TSA of hemisphere = 3$\pi$$r^{2}$

90 = 3 × 22/7 × $r^{2}$

$r^{2}$ =  90 × 7/ 22 × 3

$r^{2}$ = 105/11

r = $\sqrt{105/11}$

TSA of sphere = 4$\pi r^{2}$

4 × 22/7 × $(\sqrt{105/11}) ^{2}$

4 × 22/7 × 105/11

= 120 $cm^{2}$

Step-by-step explanation: