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A fez, the headgear cap used by the t...

A fez, the headgear cap used by the trucks is shaped like the frustum of a cone. If its radius on the open side is 10 cm, radius at the upper base is 4 cm and its slant height is 15 cm, find the area of material used for making it.

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The correct Answer is:
710 2/7 `cm^(3)`
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