Hey Krislton.

What are your formulas for the volume of a cylinder and the area of a cylinder?

Hint: The area of a cylinder (with no top) is the surface area of the cylinder and the bottom (remember circumferences for the cylinder) and the volume of a cylinder and see how to use the information in the volume to simplify the expression for the area.

You have two variables in these: r and h so you will get rid of at least one of them.