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.
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If you do not have the area, what do you have? The radius is half the diamiter The radius is PieR2 Worked backwards if you know the circumfrence.
By multiplying the diameter by pi, since the circumference of a circle is 3.14 times the diameter.
Circumfrence = pi * diameter It can be experimentally derived very easily.
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
Circumference of a circle = 2*pi*radius or pi*diameter