



 
Kenneth, Join each pair of opposite vertices to form 14 congruent triangles. One such triangle is ABC below. The angle BCA has measure 360/14 = 25.71 degrees. I redrew triangle ABC and let D be the midpoint of AB so
You said a 4 foot diameter so CD = 2 feet = 24 inches. Thus tan(12.86) = DB/CD and thus
Thus
I hope this helps,  


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