The formula is circumference= pi times diameter. pi=3.1415926.
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By multiplying the diameter by pi, since the circumference of a circle is 3.14 times the diameter.
Circumference of a circle = 2*pi*radius or pi*diameter
Circumfrence = pi * diameter It can be experimentally derived very easily.
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.
A part of a circle is called an arc. The defined values for a circle are: radius, diameter, chord, area, circumference, and the arcs. There is the circumfrence, semi circle, arc, diameter,chord,segment,radius,quaderent