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Concept

Locus

A locus is a set of points that share a certain property. For example, a circle with center and radius is the locus of points for which the distance from is equal to
A circle with origin O and radius r, depicting two radii in the image—one horizontally to the right of the origin and the other extending in the northwest direction.
Many examples of loci appear in plane geometry.
Examples of loci in plane geometry