| use a compass to find the midpoint of a line segment | Bisect |
| a device used to draw arcs and circles | Compass |
| points that are on the same line | Collinear |
| figures that are on the same plane |
Coplanar |
| Lines that cross at a vertex | Intersecting |
| a group of points that follow a never ending, straight path | Line |
| Lines that will never cross | Parallel |
| Intersecting lines that form a set of right angles. | Perpendicular |
| an endless flat surface that is named by any 3 points. | Plane |
| an exact location in space | Point |
| a part of a line with one end point | Ray |
| a part of a line with 2 end points | Segment |
| lines that are not on the same plane. | Skew |
| parallel lines that are crossed by an intersecting line | Transversal |