Determine the total surface area of a hemisphere closed at bottom. Radius of the hemisphere is $$\sqrt {\frac{{25}}{\pi }} $$ unit.
A. 75 unit2
B. 70 unit2
C. 60 unit2
D. 50 unit2
Answer: Option A
Solution (By Examveda Team)
Total surface area (TSA) of hemisphere = 3πr2Radius of hemisphere = $$\sqrt {\frac{{25}}{\pi }} $$
So, TSA = 3 × π × $${\left( {\sqrt {\frac{{25}}{\pi }} } \right)^2}$$
= 75 unit2
This Question Belongs to Arithmetic Ability >> Mensuration 3D
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