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Question

An ice cream cone has radius of 21 m and height of 20 m. Find total surface area of the cone.

A
3297 m2
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B
9734 cm2
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C
3297 mm
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D
3297 m
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Solution

The correct option is A 3297 m2
Given, radius r=21m and height h=20m.

Then, slant height is:
s2=h2+r2
s2=202+212
s2=400+441
s=841
s=29 m.

Therefore, Total surface area of a cone =πrs+πr2
=3.14×21×29+3.14×21×21
=1912.26+1384.74
=3297m2.

Hence, option A is correct.

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