3. A fez, the cap used by the Turks, is shaped like the frustum of a cone (see Fig.). 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.
The area of material used is given by :
Area of material = Curved surface area of a frustum of cone + Area of upper end
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