A fez, the cap used by the Turks, 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.

Answer

`710.28 cm^(2)`

Explanation

Area of material = curved surface area + area of closed, small circular face
`pil(r+R)+pir^(2)`.