1. Segments, Rays, and Distance
Section 1-3
Segments, Rays, and Distance

2. Segment Piece of a line Has two endpointsX Z
Piece of a line
Has two endpoints
It is named using the two endpoints,

3. Ray X Z
Part of a line
Extends indefinitely in one direction. It has exactly one endpoint.
It is named using the endpoint first,

4. Opposite Rays Formed by three collinear points Share the same endpointX Z Y
Formed by three collinear points
Share the same endpoint
For example, Y is between X and Z so and are opposite rays

5. Length Distance between two points Length is denoted for as XZ
Must be a positive number!
On a number line:
Find the absolute value of the difference of the coordinates

6. SEGMENT addition postulate
If B is between A and C, then AB + BC = AC A C B

7. Congruent:
Same size and same shape

8. Lengths are = Segments are

9. Midpoint of a segment
Point that divides the segment into two congruent segments 4 4 A B M
M is the midpoint of

10. Bisector of a segment
Can be a line, segment, ray or plane that intersects the segment at its midpoint