1. Find the Other Endpoint of a Segment
Graph the points R(-1, 7) and M(2, 4)
The midpoint of segment RP is M. One endpoint is R. Find the coordinates of the other endpoint, P.
Plot P

3. Segment and Angle Bisectors
Geometry

4. What does it mean to bisect something?
To cut or divide into two equal parts.

5. Bisecting a Segment
The midpoint of a segment is the point that divides, or bisects, the segment into two congruent segments.
A segment bisector is a segment, ray, line, or plane that intersects a segment at its midpoint

6. Bisecting an Angle
An angle bisector is a ray that divides an angle into two adjacent angles that are congruent.

7. The ray FH bisects the ∠EFG
The ray FH bisects the ∠EFG. Given that the measure of ∠EFG = 120°, what are the measures of ∠EFH and ∠HFG?
Example 1

8. Example 2
∠CBA is bisected by ray BD. The measure of ∠DBA is 65°. Find m∠CBA.

9. Example 3
In the diagram, ray RQ bisects ∠PRS. The measures of the two congruent angles are (x+40)° and (3x – 20)°. Solve for x.
(x + 40)°
(3x – 20)°

10. Example 4
If AB bisects CD at point E, then find CE.