Circumference of a Circle

Written by Jerry Ratzlaff on . Posted in Plane Geometry

circle diameter 4Circumference of a Circle formula

\(\large{ C= 2 \; \pi \; r }\)

\(\large{ C= \pi \; d }\)

\(\large{ C = \sqrt{ 4 \; \pi \; A} }\)

\(\large{ C = 2 \; \sqrt{ \pi \; A} }\)

\(\large{ C = \frac{ 2 \; A }{ r } }\)

Where:

\(\large{ C }\) = circumference

\(\large{ A }\) = area

\(\large{ d }\) = diameter

\(\large{ r }\) = radius