Oh, dude, you just gotta remember your basic math for this one. The circumference of a circle is π times the diameter, so if the diameter is 63mm, just plug that into the formula and you get 63π mm or approximately 197.92mm. Easy peasy, right?
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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
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
The circumference of a circle with a diameter of 25 is: 78.54