The locus is the set of all points that obey a particular rule or set of rules. A locus can be a line or a region.

Four basic types of loci that you need to know about are:

- Locus of points a fixed distance from a given point
- Locus of points a fixed distance from a given line
- Locus of points an equal distance between 2 lines
- Locus of points an equal distance between 2 points

Loci are also covered by this video:

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