| A | B |
|---|
| Vertical angles | are congruent |
| linear pair | adjacent angles whose sum is 180 |
| perpendicular lines | intersecting lines that form right angles |
| supplementary angles | two angles whose sum is 180 |
| complementary angles | two angles whose sum is 90 |
| adjacent angles | Angles that are next to each other |
| acute angle | an angle with a measure less than 90 |
| obtuse | an angle with a measure greater than 90 |
| right angle | an angle with a measure = 90 |
