Multiply the diameter by pi, which is approximately 3.14.
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A circumference of 62.8cm
Diameter of a circle = circumference/pi
The diameter of a circle with the circumference of 3.25 is: 1.034
If the circumference of a circle is 17.27, the diameter is: 5.5
The circumference of a circle with a diameter of 14 is: 43.982