| A | B |
|---|
| an angle less than 90 degrees | Acute |
| have same size, shape, and measure | Congruent |
| opposite angles that are congruent | Vertical |
| an angle greater than 90 degrees | Obtuse |
| an angle that measures 90 degrees | Right |
| angles that add up to 90 degrees | Complementary |
| angles that add up to 180 degrees | Supplementary |
| two angles having the same vertex and sharing one side | Adjacent |
