Circumference is about about 113.1mm
Multiply the diameter by the value of Pi - and you'll have your answer !
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If the diameter of a circle is 9 the circumference is: 28.3
If a circle has a diameter of 5 the circumference is: 31.4
The circumference of a circle with a diameter of 51m is: 160m
If a circle has a diameter of 2.25, the circumference is: 7.069
The circumference of a circle with a diameter of 25 is: 78.54