Ray
Set of points on a line that are located on the same side of a point O on the line called the origin or endpoint of the ray.
Notation
A ray is named by using the letter that represents its endpoint followed by a second letter that represents another point on the ray. This is [latex]\overrightarrow{OD}[/latex]:
Opposite rays are rays that have the same origin and that extend in opposite directions.
Properties
- Every point on a line divides the line into two opposite rays.
- Two opposite rays form a straight angle.