| A | B |
|---|
| Right angle | measures exactly 90 degrees |
| Acute angle | measure is less than 90 |
| Obtuse angle | measure greater than 90 |
| Straight angle | measures exactly 180 |
| Parallel lines | DO NOT intersect (cross) |
| Skew lines | lines that are not in the same plane |
| Perpendicular lines | Form a right angle when they meet |
| Congruent (congruency) | Geometric word to mean the measures are equal |
| Angle bisector | A line or point that cuts an angle into 2 equal parts |
| Segment bisector | A point or line that cuts another line into 2 equal parts |
| Perpendicular bisector | A line (or segment) that bisects another line and makes a right angle |
