Only circles (or spheres) have a diameter
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Diameter is a length measurement. Cubic inches is a volume measurement. Diameter cannot be measured in or converted to cubic inches.
you double the radius to find the diameter.
diameter = circumference/pi
To find the diameter of a circle you multiply the radius by 2 or d=r2
You cannot find the diameter of something from its circumference unless it is a circle and, in that case, diameter = circumference/pi