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
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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