| A | B |
| Acute Angle | measures between 0 and 90 degrees |
| Obtuse Angle | measures between 90 and 180 degrees |
| Straight Angle | measures 180 degrees |
| Right Angle | measures 90 degrees |
| zero angle | measures 0 degrees |
| Adjacent Angles | Angles that have a common side |
| Vertical Angles | Angles whose sides form lines |
| Linear Pair | Angles that have a common side and whose noncommon sides form opposite rays. |
| Complementary Angles | Angles whose sum is 90 degrees. |
| Supplementary Angles | Angles whose sum is 180 degrees. |