| __ | 1. | acute angle | | A. | an angle less than 90 degrees |
| __ | 2. | adjacent angles | | B. | an angle more than 90 degrees |
| __ | 3. | angle bisector | | C. | two angles that together make 180 degrees |
| __ | 4. | complementary angles | | D. | two angles that are next to each other (share a side) |
| __ | 5. | Linear pair angles | | E. | an angle exactly 90 degrees |
| __ | 6. | obtuse angle | | F. | an angle exactly 180 degrees |
| __ | 7. | right angle | | G. | two angles that together make 90 degrees |
| __ | 8. | straight angle | | H. | divides angle into 2 congruent angles |
| __ | 9. | supplementary angles | | I. | congruent angles formed by 2 lines |
| __ | 10. | vertical angles | | J. | angles with opposite rays that form 180 degrees |