SOLUTION: I am building a round steel pipe pen, using 2 3/8" pipe uprights as coner posts, welding 5 2 3/8" pipe rails in place leveled horizonally betweeen each corner post. The inside dia

Question 748573: I am building a round steel pipe pen, using 2 3/8" pipe uprights as coner posts, welding 5 2 3/8" pipe rails in place leveled horizonally betweeen each corner post. The inside diameter of finished pen is to be 40' 4", and made with 16 panels around the perimeter of the finished pen.
Question; What angle must each corner post be placed to finish the pen in an accurate round shape, with each corner angled the same and rails welded in place?
Answer by timvanswearingen(106) (Show Source): You can put this solution on YOUR website!
The sum of the measures of the interior angles is given by:

Where n is the number of sides. Since you have 16 panels, you have 16 sides.

There are 2,520 degrees total. Divide that by your number of angles, or joints, which is 16:

You need each angle to be 157.5 degrees.
I hope I had the right picture in my head and I hope this helps! Good luck with the pen.
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