| A | B |
|---|
| the segment addition postulate | If B is between A and C as a picture: A-----B----C, then AB + BC = AC |
| midpoint | The point that divides a segment into two congruent segments. |
| congruent segments | segments that are equal in length |
| segment bisector | a segment, line or plane that intersects a segment at its midpoint |
| Postulate or axiom | A rule that is accepted without proof. |
| Theorem | A rule that can be proved. |
| Coordinate | The real number that corresponds to a point. |
| Distance | the distance between two points A and B, written as AB, is the absolute value of the difference of the coordinates of A and B. |
| Between | When three points are collinear, you can say that one point is between the other two. |
| Segment Addition Postulate | If b is between A and C, then AB + BC = AC. |
