It is 6.366, approx.
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I'm guessing you mean 20 ft. circumference? With a 20' circumference, here's the math. C=20; C(r)=2*[pi]*r; 2*[pi]*r=20; r=10/[pi] A(r)=r2*[pi]; A=(10/[pi])2*[pi]; A= about 31.831 sq. ft.
Circumference of 20 / pi = the diameter = 6.3662 (to nearest 4th decimal)
2 pi / 2 = pi.
(pi/2)-1 = 2/pi
20/Pi = 6.37 inches