The total surface area of a hemisphere is 4158 cm2. The radius of the hemisphere is:
(use = )
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 i.e. 21 cm
Formula used
The total surface area of the hemisphere is 3πr2.
r = radius of the hemisphere
Given that
Total surface area = 4158 cm2
Calculations
3πr2 = 3 × 22/7 × r2 = 4158
r2 = 4158 × 7/66
r = 21 cm