3.141592653589793238462
64338327950288419716939
93751058209749445923078
16406286208998628034825
34211706798214808651328
238446095505
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He did some of the numbers in Pi.
3.141592535
2*pi*radius = circumference 2*pi*radius = 13 Making the radius the subject of the formula is: radius = 13/(2*pi) = 2.06901426 feet Check: 2*pi*2.06901426 = 13 feet
Generally pi is shown as 3.14, but realistically pi continues on forever.http://en.wikipedia.org/wiki/Pi
Circumference = (pi) x (diameter) = 13 pi = 40.841 feet(rounded)