# #### Circumference

## What is Circumference?

The perimeter of a circle is called circumference.

## Circumference Formulas

There are two formulas you can use to find the circumference of a circle. The first one is used the most often, but they both mean the same thing because the diameter of a circle is equivalent to two radii.

$C=2\pi r$

### Circumference from Diameter

$C=\pi d$

## How to Find the Circumference of a Circle

1. Identify the diameter or radius of the circle.
2. Plug the number into the Circumference Formula.

## Examples

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