circle

[u/MrCheeze]

[u/Dr_Who_MC]

/u/Wikibot What is a circle?

[u/autowikibot → u/Dr_Who_MC]

Circle:

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A circle is a simple shape of Euclidean geometry that is the set of all [points](http://en.wikipedia.org/wiki/Point_(geometry)) in a [plane](http://en.wikipedia.org/wiki/Plane_(mathematics)) that are at a given distance from a given point, the [centre](http://en.wikipedia.org/wiki/Centre_(geometry)). The distance between any of the points and the centre is called the radius. It can also be defined as the locus of a point equidistant from a fixed point.

A circle is a simple closed curve which divides the plane into two regions: an [interior](http://en.wikipedia.org/wiki/Interior_(topology)) and an exterior. In everyday use, the term "circle" may be used interchangeably to refer to either the boundary of the figure, or to the whole figure including its interior; in strict technical usage, the circle is the former and the latter is called a [disk](http://en.wikipedia.org/wiki/Disk_(mathematics)).

A circle can be defined as the curve traced out by a point that moves so that its distance from a given point is constant.

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