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Question

The radius of the base and the height of a right circular cone are 7 cm and 24 cm respectively Find the total surface area of the cone

A
704 cm2
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B
70.4 cm2
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C
7.04 cm2
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D
0.704 cm2
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Solution

The correct option is B 704 cm2
Given : radius (r)=7 cm height (h)=2 cm Then
l2=h2+r2=242+72
or l=625 cm = 25 cm
Total surface area of the cone = Curved surface area + Area of base
=πrl+πr2=(227×7×25)+(227×7×7)=704cm2

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