If the total surface area of a hemisphere is 1848 m2, then the diameter (in m) of the hemisphere is: (Use π = 22/7).
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Correct answer: D
Explanation
The correct answer is option 4 i.e 28.
Total surface area of a hemisphere = 3πr2
⇒ 3 × (22/7) × r2 = 1848
⇒ (66/7) × r2 = 1848
⇒ 66 × r2 = 12936
r2 = 12936 / 66 = 196
So, r = √196 = 14
Diameter = 2 × r = 2 × 14 = 28 m