A solid sphere has a surface area of 616 cm2. This sphere is now cut into two hemispheres. What is the total surface area of one of the hemispheres?
Show answer & explanation
Correct answer: B
Explanation
The correct answer is Option 2 i.e. 462 cm2.
4πr2 = 616
⇒ r2 = 616/(4 × 22/7) = 49
⇒ r = 7 cm
Hemisphere total surface area = 3πr2 = 3 × (22/7) × 72 = 462 cm2