Circumference of a Circle

The circumference of a circle is the total length of the boundary or perimeter of the circle. It is the distance you would travel if you were to walk around the circle.

Circumference of a Circle formula
\( C \;=\; 2 \; \pi \; r \)
Symbol	English	Metric
\( C \) = Circumference	\( in \)	\(mm  \)
\( \pi \) = Pi	\(3.141 592 653 ...\)	\(3.141 592 653 ...\)
\( r \) = Radius	\( in \)	\(mm \)