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, then find the area of material used for making it.
Radius of open side, R = 10 cm,
Radius of upper base, r = 4 cm and
slant height, l = 15 cm
The area of material used =π (R + r)l +πr2
≈ 710.28 cm2
So, the area of material used for making the fez is 710.28 cm2.