# Circumference

Circumference is the distance around a circle, equal to pi times the circle's diameter.[1] The formula is written, algebraically, as follows: $\pi\ D$ where D is the circle's diameter.

Alternatively, it can be written as: $2 \pi\ r$ where 'r' is the circle's radius.

## References

1. Wile, Dr. Jay L. Exploring Creation With General Science. Anderson: Apologia Educational Ministries, Inc. 2000