maths question.. proving h=2r?? relationship between a volume for a cylinder...

...and minimum surface area? I'm working on supporting the equation h=2r. basically I ended up with 2 r values, so I could set them equal to each other in order to solve for h and ultimately support the equation h=2r. I know the equation is correct as I checked it with my maths teacher.

basically I now need to solve this equation in terms of h..


2^ ?[ (V*h)/(pi) ] = 3^ ?[ V/(2*pi) ]

the roots cover the entire [ ] areas.

with working please!

thank you soooooooooo much.
 
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