# Circumference of a Circle

on . Posted in Plane Geometry

## Circumference of a Circle formula

$$\large{ C = 2 \; \pi \; r }$$
Symbol English Metric
$$\large{ C }$$ = circumference $$\large{ in }$$ $$\large{mm }$$
$$\large{ \pi }$$ = Pi $$\large{3.141 592 653 ...}$$
$$\large{ r }$$ = radius $$\large{ in }$$ $$\large{mm }$$