Question : The radius of a right circular cylinder is 7 cm. Its height is thrice its radius. What is the curved surface area of the cylinder?
Option 1: 724 cm2
Option 2: 666 cm2
Option 3: 924 cm2
Option 4: 264 cm2
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Correct Answer: 924 cm 2
Solution : Given: The radius of a right circular cylinder, $r$ = 7 cm Its height, $h$ is thrice its radius = 7 × 3 = 21 cm The curved surface area of the cylinder $=2\pi rh$ $=2\times \frac{22}{7}\times 7\times 21=924$ cm 2 Hence, the correct answer is 924 cm 2 .
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