Line that divides an angle into two congruent angles.

### Examples

- In this illustration, line
*d*is the bisector of angle*A*:

If \(m< 1=m< 2\), then line *d* is the bisector of angle *A*.

If *d* is the bisector of angle *A*, then \(m< 1=m< 2\)

- In the triangle
*ABC*below, the three bisectors \(\overleftrightarrow{AM}\), \(\overleftrightarrow{BN}\) and \(\overleftrightarrow{CP}\) converge at the same point, which is equidistant from each side of the triangle: