15.92mm
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circumference = pi*100mm
The circumference of a circle with a diameter of 31.8mm is about 100mm (99.990265mm)
Diameter = Circumference/pi
Circumference is pi times diameter. Diameter is circumference divided by pi. Diameter is twice the radius. Radius is half the diameter.
Since the circumference is Pi times the diameter then divide the circumference by Pi (3.14159) to get the diameter