A cylinder has volume of 10m^3. What are the dimensions that will give the maximum & minimum surface areas. (if there is no max or min state why)

I think I need to make a function for surface area, use max & min of the deriv perhaps?

not sure how to turn this into deminsions

EDIT:

So for a first step I solved volume equation for H and then do I put that back into my surface area equation?