| A | B |
|---|
| ray | part of a line that has one endpoint |
| segment | part of a line that has two endpoints |
| line | between any two points exactly one can be drawn |
| point | dot represented by a letter |
| space | consist of many points |
| plane | region in space consisting of points and lines |
| parallel lines | lines that do not intersect |
| perpendicular lines | lines that intersect forming right angles |
| skewed lines | lines that do not lie in the same plane |
| collinear | points that lie on the same line |
| coplanar | points and lines that lie in the same plane |
