1. 1.5 Segment and Angle Bisectors Goal 1: Bisect a segment Goal 2: Bisect an angle CAS 16, 17

2. Midpoint A midpoint of a segment is the point that divides or bisects the segment into two congruent segments. AB M

3. Congruent Marks and Congruent Arcs Small red marks used to identify congruent segments. AB M

4. Segment Bisector A segment bisector is a segment, ray, line, or plane that intersects a segment at its midpoint AB M Line MN is the bisector N

5. Construction A construction is a geometric drawing that uses a limited set of tools, usually a compass and a straight edge.

6. Midpoint Formula If A(x 1,y 1 ) and B(x 2,y 2 ) are points in a coordinate plane, then the midpoint of AB has coordinates (4, -1) (-2, 4)

7. Angle Bisector An angle bisector is a ray that divides an angle into two adjacent angles that are congruent. C A D B