A bisector cuts something in half.
An angle bisector is a line which cuts a given angle in half.
The perpendicular bisector of a line segment is the line which cuts the given segment in half and is at right angles to it.
![Angle bisector on the left and perpendicular bisector of a line on the right](/glossary/bisector/images/bisector.png)
A bisector cuts something in half.
An angle bisector is a line which cuts a given angle in half.
The perpendicular bisector of a line segment is the line which cuts the given segment in half and is at right angles to it.