| A | B |
|---|
| Supplementary angles | Two angles whose sum is 180. |
| Complementary angles | Two angles whose sum is 90. |
| Vertical angles | Congruent angles formed by intersecting lines. |
| Acute | An angle whose measure is less than 90. |
| Right | An angle whose measure is 90. |
| Obtuse | An angle whose measure is more than 90 but less than 180. |
| Straight | An angle whose measure is 180. |
| Midpoint Formula | ((x1 + x2)/2, (y1 + y2)/2) |
| Bisect | To cut in half |
| To name a ray... | use the starting point and a direction point. |
| To name a line... | use any two points on the line |
| To name an angle... | use three points, with the vertext in the middle. |
| To name a segment... | use the endpoints. |
| Key word for midpoint process. | Average |
