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.


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 \(\overrightarrow{OD}\):

Opposite rays are rays that have the same origin and that extend in opposite directions.


  • Every point on a line divides the line into two opposite rays.
  • Two opposite rays form a straight angle.


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