The circumference is about 84.82mm
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The circumference of a circle with a diameter of 25 is: 78.54
If the diameter of a circle is 9 the circumference is: 28.3
If a circle has a diameter of 2.25, the circumference is: 7.069
The circumference of a circle with a diameter of 51m is: 160m
If a circle has a diameter of 5 the circumference is: 31.4