1. A locus is a set of points satisfying some property. It can be thought of as the path traced by a point that moves subject to a particular rule. Set of points P equidistant from a given point X.

2. A locus is a set of points satisfying some property. It can be thought of as the path traced by a point that moves subject to a particular rule. Set of points P equidistant from a given point X.

3. Set of points P equidistant from two given points X and Y.

5. Set of points P equidistant from three given points X, Y and Z (not collinear).

7. Set of points P equidistant from a given line.

9. Set of points P equidistant from two given parallel lines and m.

11. Set of points P equidistant from two given non-parallel lines and m.

13. Set of points P equidistant from a given circle C.

15. Set of points P equidistant from two given circles C 1 and C 2.

16. Set of points P equidistant from a given point F and a given line.