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Question

The curved surface area of a right circular cone of height 84cm and diameter 70cm is:

A
10010 cm2
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B
100000 cm2
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C
10020 cm2
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D
11000 cm2
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Solution

The correct option is A 10010 cm2
Given, h=84cm is the height of right circular cone and diameter is d=70cm.
Then radius of right circular cone =d2=702=35cm.

Therefore, the curved surface area of a right circular cone
=πrl

=πr(r2+h2)

=227×35((84)2+(35)2)

=110(7056+1225)

=110×91=10010 cm2.

Hence, option A is correct.

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