Circumference is pi * d. Solve for d. d = Circumference / pi
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If you know the circumference, the ration of the diameter to the circumference is π, so diameter = circumference/π If you have the radius, diameter = 2 x radius
Diameter = circumference/pi
The diameter is the circumference divided by pi.
circumference of a circle = pi * diameter.
If you know the circumference, use the formula for circumference (C=pi*diameter), but rearrange it to get Diameter= circumference/pi. Then just sub in values.