The video below is a demonstration of how to create the an angle bisector. With the activity below, students will discover some very cool properties.

The following video shows students how to construct an angle bisector using Promethean's Activeinspire software. However, you can use paper and pencil using a compass and straight edge to do so.

Below you can find a modified Geometer's Sketchpad Activity from Key Curriculum's Discovery Geometry series, which is the textbook that we use at School Without Walls in the District. The objective of the activity is for students to see that a bisector cuts and an angle into to equal parts. Students will also see how points on an angle bisector relate to the sides of the angle.

This is a Java Applet created using GeoGebra from - it looks like you don't have Java installed, please go to

Nicholas F. Bennett, Created with GeoGebra