Frustum of a Cone

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

The raddi of the ends of a frustum of a cone $45 cm$ high are $28 cm$ and $7 cm$.Find its volume.

A drinking glass is in the shape of a frustum of a cone of height $14 cm$.The diameter of its two circular ends are $4 cm$ and $2 cm$.Find the capacity of the glass.(Take $\pi =\frac{22}{7}$)