by multiplying pi (3.14) multiplyed by the 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.
The formula is circumference= pi times diameter. pi=3.1415926.
circumfrence off the circle
Circumfrence = pi * diameter It can be experimentally derived very easily.
By multiplying the diameter by pi, since the circumference of a circle is 3.14 times the diameter.