Formular for total surface area of a cylinder
[tex]TSAofacylinder=2nr^2\text{ + 2nrh}[/tex][tex]\begin{gathered} T\mathrm{}S\mathrm{}A\text{ = 2 }\times\text{ }\pi\text{ }\times7^2\text{ + 2 }\times\pi\times7\times21ft^2^{} \\ \text{ = 307.876 + }923.628 \\ \text{ = 1231.504 ft}^2 \\ =1231.5ft^2\text{ (nearest tenth)} \end{gathered}[/tex]S = 1231.5 sq ft
