The answer is 3215.36. The formula for pi is A= pi times radius squared or A=pi r2
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If the area of a circle is 64 square units the diameter is: 9.027 units.
That will depend on whether the 64 inches is the radius, diameter, or circumference of the circle.
64 pi sqcm
64 pi
The circumference (full circle) is the diameter multiplied by pi. For the "half-circle", you would have to divide that by 2.