[tex]\begin{gathered} \text{Surface area of a cylinder =}^{} \\ 2\pi r^2\text{ + 2}\pi rh \\ r\text{ = }\frac{11ft}{2}\text{ = 5.5ft} \\ h=42ft \\ \\ \text{Area = 2 x 3.14 x5.5}^2\text{ + 2 x 3.14 x 5.5 x 42} \\ =189.97\text{ + 1450.68} \\ =1640.65ft^2 \end{gathered}[/tex]
