Guys I am terrible when it comes to numbers, I did find a calculator for this that came up with 29" but I could not find an example. So I have a aluminum rod that has a 1" dia by 9" long so how would I go about how to figure the surface square inches? If you could give and example plus a formula that would help me understand.
I took one of those cloth tape measure and wrap it around the rod came up with almost 3" dia. then multiply that by 9 and I come up with 27 square inches. Trying to teach myself how to anodize aluminum which I also have to figure how many sq ins surface to setup the power supply.Thanks guys