| A | B |
|---|
| Formed by two rays | angle |
| Common endpoint for two rays | vertex |
| An angle measuring less than 90 degrees | acute |
| An angle measuring exactly 90 degrees | right |
| An angle measuring more than 90 degrees but less than 180 degrees | obtuse |
| angle measures exactly 180 degrees | straight |
| Angles with the same measure | congruent |
| Angles formed opposite each other when two lines intersect | vertical |
| Angles that are side by side and have a common vertex and ray | adjacent |
| Two angles whose measures have a sum of 90 degrees | complementary |
| two angles whose measure has a sum of 180 degrees | supplementary |
