1.  Segments, Rays, and Parallel Lines

2.  Segment : is part of a line that has a beginning point and an endpoint.  Written notation. A B

3.  A ray is the part of a line that has a beginning point and goes through another point without end, in that direction.  Written notation. A BD C AB CD

4.  Opposite rays are two collinear rays with the same beginning point. (line)  Written notation. B A C AB, AC

5.  Parallel lines are coplanar lines that do not intersect. A B C D

6.  Skew lines do not lie in the same plane, are not parallel, and do not intersect. ABAB S T

7.  Parallel planes are planes that do not intersect. P S Plane P is parallel to plane S

8.  AB and AD ______  AB and ST are  AB and RS are  Plane ADR and BCS  Plane RCS and ABC  Intersect at point A  Skew lines  Parallel lines  Parallel planes  Intersect along the line DC.

9.  Is CB parallel to GF ?  Is plane AED parallel to plane FGH ?  Are AB and HG skew lines ? B A E D C H I J F G No Yes