Circle


            https://term.museum-digital.de/md-de/tag/18113

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Note: "A circle is a shape consisting of all points in a plane that are at a given distance from a given point, the centre; equivalently it is the curve traced out by a point that moves in a plane so that its distance from a given point is constant. The distance between any point of the circle and the centre is called the radius. Usually, the radius is required to be a positive number (Circle with

r

=

0

{\displaystyle r=0}

is a degenerated case). This article is about circles in Euclidean geometry, and, in particular, the Euclidean plane, except where otherwise noted." - (en.wikipedia.org 14.12.2021)