pi times diameter
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The circumfrence is like a perimeter. It is the area around a circle. You can find the circumfrence of a circle by using this formula. Pi x R2 or Pi times the radius squared.
The formula for the circumference of a circle is C = πd, π = 3.142, d = 4cm C = 3.142 x 4cm C = 12.568cm
the formula to find the circumference of a circle is pi times the diameter. So basically take the diameter and multiply it by 3.14 and that's the circumference.
18.84
The circumference of a circle is (diameter) multiplied by (pi).