If the ratio of the radius and height of a cylinder is 3 : 2 and radius is 21 cm, then the curved surface area (in cm2 ) is: ( Use π = 22/7)
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Correct answer: A
Explanation
The correct answer is Option 1 i.e. 1848.
The ratio of the radius and height of a cylinder is 3 : 2
Radius = 21 cm
⇒ 3x = 21
⇒ x = 7 cm
so, height = 2x = 14
The curved surface area = 2πrh
⇒ 2 × 22/7 × 21 × 14 = 1848 cm2