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An '''angle bisector''' is a line or ray that intersects an angle and evenly divides it into two [[congruent]] angles.
An (interior) '''angle bisector''' (also called an '''internal angle bisector''') is a line or ray that intersects an angle and evenly divides it into two [[congruent]] angles.
[[category:Plane Geometry]]
[[category:Plane Geometry]]
The angle bisector theorem concerns the relative lengths of the two segments that a triangle's side is divided into by a line that bisects the opposite angle. It equates the relative lengths of the segments to the relative lengths of the other two sides of the triangle.