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Question

If the radius and slant height of a cone are 20 cm and 29 cm respectively. Find its volume.

A
8800 cm3
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B
800 cm3
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C
880 cm3
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D
None of these
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Solution

The correct option is A 8800 cm3
We have,
r=20 cm,l=29 cm.

We know, slant height
l2=r2+h2.

So,
h2=(29)2(20)2

h2=841400=441

h=21 cm.

We know that the volume of the cone
=13πr2h

=13×227×202×21

=8800 cm3.

Hence, option A is correct.

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