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The height of a solid right circular cylinder is 6 metres and three times the sum of the area of its two end faces is twice the area of its curved surface. The radius of its base (in metre) is
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- 4
- 2
- 8
- 10
- 4
Correct Option: A
Let the radius of the base be r metre.
then 3 × 2πr² = 2 × 2πrh
⇒ 3r = 2h
⇒ 3r = 2 × 6
⇒ r = 4 metre
