The formula for the circumference of a circle is C = pi x d, where C is circumference, pi is 3.14, and d is diameter.
C = 3.14 x 64in = 200.96in
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37 45/64 inches.
That will depend on whether the 64 inches is the radius, diameter, or circumference of the circle.
C = pi d so d = C/ pi divide the circumference by pi
510mm
The circumference (full circle) is the diameter multiplied by pi. For the "half-circle", you would have to divide that by 2.