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Question

The lateral surface area (in cm2) of a cone with height 3 cm and radius 4 cm is:

A
6267
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B
5267
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C
3137
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D
1557
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Solution

The correct option is A 6267
We know, lateral/curved surface area of a cone =πrl, where r is the radius of the cone and l is the slant height.
For a cone, l=h2+r2, where h is the height.

Hence, l=32+42

l=25

l=5 cm.

Hence, Curved surface area of the cone =227×4×5=6267cm2.

Therefore, option A is correct.


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