Explanation
We are given the following:
[tex]\begin{gathered} height=8m \\ radius=4m \\ \pi=3.14 \end{gathered}[/tex]We are required to determine the surface area of a cylinder. This can be achieved by using the formula:
[tex]\begin{gathered} Area=2\pi r(r+h) \\ Area=2\times3.14\times4(4+8) \\ Area=2\times3.14\times4\times12 \\ Area=301.44m^2 \end{gathered}[/tex]Hence, the answer is 301.44m².