If the curved surface area of a solid right circular cylinder of height h and radius r is one-third of its total surface area, then:
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Correct answer: D
Explanation
The correct answer is Option 4 i.e. h = ()r.
C.S.A of the cylinder = 2πrh
T.S.A of the cylinder = 2πr(r + h)
⇒ 1/3 × 2πr(r + h) = 2πrh
⇒ 1/3 × (r + h) = h
⇒ r + h = 3h
⇒ r = 2h
⇒ h = r/2