| A | B |
|---|
| point | a position in space (no size, only location, named by a letter) |
| line | continues without end in opposite directions (has no thickness, is named by two points on a line) |
| plane | a flat surface that extends indefinitely in four directions (has no thickness) |
| segment | a part of a line (made up of two points, and all of the points inbetween) |
| ray | a part of a line (made up of one endpoint, and all the points of the line on one side of the endpoint) |
| collinear | a set of points that a line can be drawn through |
| noncollinear | a set of random points that a line cannot be drawn through |
| parallel lines | lines in the same plane that do not intersect |
| parallel segments | parallel segments lie in parallel lines |
| vertical | a line that goes up and down, it is perpendicular to the horizon |
| horizontal | a line that goes back and forth, it is parallel to the horizon |
| skew lines | lines that lie in different non-parallel planes (neither parallel nor intersecting) |
