The curved surface area of a cylinder of height 42 cm is 3960 cm2. Find its volume. (π = 22/7)
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Correct answer: A
Explanation
The correct answer is option 1 i.e. 29700 cm3.
Given CSA = 2πrh = 3960 and h = 42
2πh = 2 × (22/7) × 42 = 264 ⇒ r = 3960 ÷ 264 = 15 cm
Volume = πr²h = (22/7) × 15² × 42 = 29700 cm³