# Distance, Segment, and Rays

**Ruler Postulate: **The points on a line can be paired with real numbers so that, given any two points P & Q on the line, P corresponds to zero and Q corresponds to a positive number.

A **segment** is a part of a line that begins at one point and ends at another. The points are called the endpoints of the segment. Either AB or BA can be used to name the segment.

**Segment Addition Postulate: **If C is between A and B, then AC + BC = AB

Find out more about distance, segment, and rays by reading the explanation below.

**Practice:** Answer the following exercises about distance, segment, and rays.