Locus

"Locus" is a Latin word for "place."  Its plural is "loci."  In geometry, "locus" refers to a set of points that are described by some statement about their position.  For example, the locus of points that are 1 unit from point A refers to the set of all points that are 1 unit from point A.  This would be the circle with center A:

Some locus problems are restatements of theorems in geometry, such as the following examples.

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