Question

Find the surface area of the solid. used 3.14 for π. write your answer as a decimal

Answer 1

We have to find the surface area of the cylinder.

The radius is 7 ft and the height is 21 ft.

We can write this as:

`\begin{gathered} A=2\cdot A_b+A_f \\ A=2\cdot\pi r^2+2\pi rh \\ A=2\cdot3.14\cdot7^2+2\cdot3.14\cdot7\cdot21 \\ A=2\cdot3.14\cdot49+2\cdot3.14\cdot7\cdot21 \\ A=307.72+923.16 \\ A=1230.88\text{ ft}^2 \end{gathered}`

Answer: the surface of the cylinder is 1230.88 square feet.