Question 322436
the distance from the center of a regular polygon to the midpoint any side is called the APOTHEM


using the formula from this page (http://www.mathopenref.com/polygonapothem.html)
___ you can custom design as you see fit


a quick calculation shows that if you use 7 sides without cutting the 4X8 sheets
___ you will have about 4 inches of clearance on all sides of a 16 ft diameter