The area of a circle with a 6.4 yard radius is: 36.32 square yards OR 326.88 square feet.
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The area of a circle is (pi)(r^2). Set this equal to 64 and solve for the radius. r = sqrt(64/pi)
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