The height of a right cylinder is 2r, where r is the radius. Write a function f in simplest form that represents the ratio of the surface area to the volume.

F = 3/r.

The formula for the volume of a cylinder is

V=πr²h. We know that h=2r, so this gives us:

V = πr² (2r) = 2πr³

The surface area of a cylinder is the sum of the areas of all of the faces. The bottom and top are circles, whose areas are both given by A=πr². The lateral area of a cylinder is given by the circumference multiplied by the height. C = 2πr, and the height is 2r, so the lateral area would be

A = (2πr) (2r) = 4πr². This gives us a total surface area of

SA = 4πr²+πr²+πr² = 6πr².

The ratio of surface area to volume would be:

SA/V = 6πr²/2πr³. After simplifying, we have f=3/r.