The total surface area of a closed hemisphere is 4158. What is the diameter of the hemisphere? [Use π=22/7]
Show answer & explanation
Correct answer: C
Explanation
The correct answer is option 3 i.e. 42 cm.
The total surface area of a closed hemisphere = 4158
The total surface area of a closed hemisphere = 3πr2
3πr2 = 4158
⇒ 3 × 22/7 × r2 = 4158
⇒ r2 = 441
r = 21
d = 2r = 42