Circumference of a circle = 2*pi*radius or pi*diameter
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It depends on what information you have: radius, diameter, lengths of tangents from a point outside the circle, length of chord and its distance from the centre, etc. Also, the term is circumference, not circumfrence.
By multiplying the diameter by pi, since the circumference of a circle is 3.14 times the diameter.
The formula is circumference= pi times diameter. pi=3.1415926.
circumfrence off the circle
Circumfrence = pi * diameter It can be experimentally derived very easily.