Math question

[Steve Clardy]

I have a 9" I.D round tube and need to build a square tube with the same volume inside, or close, could be a little smaller. What size does the square tube need to be? All answers appreciated. Steve

[Jason Roehl]

I have a 9" I.D round tube and need to build a square tube with the same volume inside, or close, could be a little smaller. What size does the square tube need to be? All answers appreciated. Steve

7.976" inside, so 8" inner dimension should work.

[Steve Clardy]

7.976" inside, so 8" inner dimension should work.

Thanks Jason. I'm fixing to do some dust collector fabing with ideas from Terry H. Steve