Definition of Locus

Meaning and examples of locus

What is a locus anyway?


A locus is the set of points that form a geometric figure or a graph. This word is confusing due to its overly abstract nature.

Translation into 'english'

A locus is just a bunch of points that satisfy a certain condition or rule.

(Still pretty abstract, I know, but look at the examples below to try to better undersand what a locus is)

Examples of commonly studied loci

Shape Rule/Condition Satisfied
Circle set of points that are the same distance(known as the radius) from the center of the circle
Parabola a parabola is the set of all points that are the same distance from a point (called the focus) and a line(called the directrix). As shown in the image below:

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