| A | B |
| The locus of points 3 cm from point P | A circle with a radius of 3 cm with a center at P.,  |
| The locus of points 3 cm from line l | A pair of parallel lines 6 cm apart, with line l between them.,  |
| The locus of points equidistant from points P and Q | The perpendicular bisector of segment PQ,  |
| The locus of points equidistant to parallel lines l and m. | The line that is exactly between lines l and m, parallel to l and m,  |
| The points that are equidistant to intersecting lines l and m | Two angle bisectors of the angles formed by l and m,  |
| Locus | The collection of all points that satisfy a condition |
| Condition | A rule |
| Compound Locus Problem | A problem that requires you to satisfy two or more simple locus conditions |