Chapters

A locus is a set of points that satisfy a certain condition or criteria.

The criteria that defines the locus has to be translated to an algebraic language in order to solve problems involving types of locus.

## Examples of Locus

**Perpendicular Bisector**

The perpendicular bisector of a line segment is the locus of points on the plane that are equidistant from the endpoints.

## Example

Find the equation of the perpendicular bisector of the line segment with endpoints A = (2, 5) and B = (4, −7).

### Angle Bisectors

The bisector of an angle is the locus of points on the plane that are equidistant from the rays that form the angle.

The two angle bisectors are perpendicular between themselves.

Find the equations of the angle bisectors which determine the lines r ≡ 3x − 4y + 5 = 0 and s ≡ 6x + 8y + 1 = 0.

Find the equations of the angle bisectors that form the line r ≡ 3x − 4y + 3 = 0 with the coordinate axes.

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