Question

What is the surface area of the right cylinder below?A. 509 sq. unitsB. 72 sq. unitsC. 113 sq. unitsD. 622 sq. units

Answer 1

The surface area of a cylinder is found using the following formula:

`SA=2\pi r^2+2\pi rh`

Replace for the given values of radius and height:

`\begin{gathered} SA=2\pi(9)^2+2\pi(9)(2) \\ SA=2\pi(81)+2\pi(18) \\ SA=622 \end{gathered}`

It means that the surface area of the cylinder is 622.

The correct answer is D. 622 sq units.