Circumference = diameter x pi. Therefore, just divide the circumference by pi to get the diameter.
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The circumference of a circle with a diameter of 13 mm is: 40.84 mm
The circumference of a circle that is 16 mm in diameter is 50.27 mm
Diameter of any circle = circumference/pi
The diameter of a circle with a 19 mm circumference is about 6.048 mm (d = c divided by Pi).
If the diameter is 25 mm then the circumference is 78.54 mm.