1. Segment Bisector
Definition: a line, ray or segment that passes through the midpoint of the segment.
Picture: 𝐿𝑂 is the bisector of 𝐴𝐵

2. Perpendicular Bisector
Definition: a bisector that is perpendicular to the segment.
Picture: 𝐶𝐷 is the bisector of 𝐴𝐵

3. Coincide
Definition: Exactly on top of each other.

4. Equidistant
Definition: the same distance from a point or two different points.

5. Perpendicular Bisector Conjecture
If a point is on the perpendicular bisector of a segment, then it is equidistant from the endpoints.

6. Constructing a Perpendicular Bisector

7. Construction of a Perpendicular Bisector

8. Construction of a Perpendicular Bisector