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# Circle

A circle is a geometrical figure where all its points are equidistant from a single point (the center). This distance is called the radius.

A circle is empty, a filled circle is a disc.

## Properties

### Perimeter

The perimeter of a circle is given by ${\displaystyle 2\pi r}$, where ${\displaystyle r}$ is the radius of the circle.

### Area

The area or a circle is given by ${\displaystyle \pi r^{2}}$.

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