| __ | 1. | Acute angle | | A. | Lines that form a right angle |
| __ | 2. | Adjacent angles | | B. | Angle whose measure is less than 90 degrees |
| __ | 3. | Complementary angles | | C. | Angles with same vertex and one common side |
| __ | 4. | Degree | | D. | Unit of measure used for angles |
| __ | 5. | Obtuse angle | | E. | Angle whose measure is greater than 90, less than 180 |
| __ | 6. | Perpendicular lines | | F. | Angle whose measure if 90 degrees |
| __ | 7. | Right angle | | G. | Two angles whose measure adds to be 90 degrees |
| __ | 8. | Straight angle | | H. | Angle whose measure is 180 degrees |
| __ | 9. | Supplementary angles | | I. | Two angles whose measure adds to be 180 degrees |
| __ | 10. | Vertical angles | | J. | Angles with same vertex and sides formed by the same lines |