| A | B |
|---|
| Right Angle | An angle that measures exactly 90 degrees |
| Straight Angle | An angle that measures exactly 180 degrees |
| Acute Angle | An angle that measures less than 90 degrees |
| Obtuse Angle | An angle that measures between 90 and 180 degrees |
| Congruent Angles | Two angles that have the same measure |
| Vertex | The endpoint where two rays meet, forming an angle |
| Bisect | To separate an angle into two congruent angles |
| Degrees | The unit that angles are measured by |
| Supplementary Angles | Two angles whose sum is 180 degrees. |
| Complementary Angles | Two angles whose sum is 90 degrees. |
