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Question

A cone-shaped paper cup has a volume of 142 cubic centimetres and a height of 8.5 centimetres. What is the radius, to the nearest centimetre, of the paper cup?
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A
2
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B
4
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C
8
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D
12
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Solution

The correct option is B 4
Volume of a cone is given by πr2h3.
Hence, πr2h3=142
πr2h=426
πr2(8.5)=426
πr2=50 (approx)
r2=15.96 (approx)
r=4 (approx)

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