Write the formula for finding volume of a frustum of a cone

A solid iron pole consists of a cylinder of height $220 \mathrm{cm}$ and base diameter $24 \mathrm{cm}$, which is surmounted by another cylinder of height $60 \mathrm{cm}$ and the radius $8 \mathrm{cm}$. Find the mass of the pole, given that $1 {\mathrm{cm}}^3$ of iron has approximately $8 \mathrm{g}$ mass. (Use $\mathrm{\pi }=3.14)$

A wooden article was made by scooping out a hemisphere from each end of a solid cylinder, as shown in the figure. If the height of the cylinder is $10 \mathrm{cm}$ and its base is of radius $3.5 \mathrm{cm}$, find the total surface area of the article.