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Thank you for the additional thoughts. Yes, these are conditions I need to factor in to my design.

So, without getting into too many decimal points, my 4 foot diameter circle can be created by multiplying pi times the diameter I need. 3.14 x 4= 12.56. My pipe needs to be roughly 12 and a half feet to make a four foot hoop. Thank you all for your expertise. This will help me finish an art...

I'm sure this is a basic high school problem, but I don't know the answer, hence I am here. I need to bend a straight pipe into a circle and need to know how to figure out how long the pipe needs to be to create a 4 foot diameter circle. Any help would be greatly appreciated.