How do you calculate the surface area to volume ratio of a cylinder?

Surface Area = 2*pi*(r^2) + 2*pi*r*h

Volume = pi*(r^2)*h

For a cylinder with a radius of r and a height of h.

The ratio then is:

[ 2*pi*(r^2) + 2*pi*r*h ] / [ pi*(r^2)*h ] =

(2/h) + (2/r) =

2*{ (1/h) + (1/r) }