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Question

There is a tent in conical shape. The slant height of the tent is 14 m. If the curved surface area of cone is 308 m2  then base area of tent is


  1. 132

  2. 224

  3. 254

  4. 154


Solution

The correct option is D

154


The curved surface area of a cone is πrl where r is radius and l is slant height.

308=πrl

r=308×722×14=7 m

So, base area =πr2

=227×72

=154 m2

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