1. Drill What lines are coplanar with line AB?
Where do planes ABC and AEF intersect? H G E F D C A B

2. 1.3 Segments, Rays, Parallel Lines and Planes

3. Segments: Are parts of lines, they have two endpoints, and are named by using the two endpoints.

4. Rays: is a “half-line”. It has one endpoint and extends infinitely in one direction.
To name a ray you put the endpoint first then the second point based on the direction of the ray. With a ray on top of the two letters.

5. Opposite Rays: share the same endpoint and go in opposite directions.Z X Y

6. Parallel Lines: are lines that are in the same plane and do not intersect.

7. Parallel Planes: Two planes that never intersect.
Skew Lines: Lines that do not intersect but are not parallel, because they are in different planes.

8. Homework
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