The area of a circle is (pi)(r^2). Set this equal to 64 and solve for the radius.
r = sqrt(64/pi)
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Radius of circle: square root of (64/pi) = 4.5135166683 feet
64 pi
radius = square root of (200.96/pi).
It is: pi*82 = 64*pi square units
The area of a circle if the radius is 9m 254.5m2