| A | B |
|---|
| acute angle | angle measure between 0 and 90 degrees |
| right angle | 90 degree angle measure |
| obtuse angle | angle measure between 90 and 180 degrees |
| straight angle | angle measure = 180 degrees |
| complementary angles | sum of two angles = 90 |
| supplementary angles | sum of two angles = 180 |
| adjacent angles | two angles with a shared side on the interior of the angle formed by the noncommon sides |
| linear pair | angles that are adjacent and their noncommon sides are opposite rays |
| vertical angles | two angles whose sides form two lines |
| angle bisector | a ray that divides an angle into two equal parts |
