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A fez, the cap used by the Turks, is sha...

A fez, the cap used by the Turks, is shaped like the frustum of a cone (see Figure). 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:
`710.28 cm ^(2)`
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