i have tried searching that too but it was unfound i hope yu find your answeeer!
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Multiply pi by the diameter.
The circumference of a circle is (diameter) multiplied by (pi).
Circumference is pi times the diameter
Pi x the diameter of the circle will hive you the circumference. The diameter is double the radius so the answer to your question is pi2r.
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.