| A | B |
|---|
| ray | Extends indefinitely in ONE direction, has exactly ONE endpoint. |
| angle | Figure formed by TWO NONCOLLINEAR rays with a common endpoint. |
| adjacent angles | Coplanar angles with a common vertex, common side, and NO common interior points. |
| vertical angles | 2 non-adjacent angles that share a vertex and are formed by intersecting lines. |
| linear pair | Adjacent angles whose non-common sides are opposite rays. |
| perpendicular lines | 2 lines that intersect to form 4 right angles. |
| complementary angles | 2 angles whose measures sum to 90 degrees. |
| supplementary angles | 2 angles whose measures sum to 180 degrees. |
| acute angle | Angle with a measure of less than 90 degrees. |
| obtuse angle | Angle with a measure of more than 90 degrees AND less than 180 degrees. |
| right angle | Angle with a measure of exactly 90 degrees. |
| straight angle | Angle with a measure of exactly 180 degrees. |
| vertex | The common endpoint of the 2 rays forming an angle. |
| opposite rays | 2 rays that together form a straight angle. |
| measure of an angle | The number of degrees between the sides of the angle. |
| Angle Addition Postulate |  |
| Angle Addition Postulate | The sum of the measures of two adjacent angles equals the measure of whole large angle. |
| congruent | Having the same measure. |
| angle bisector | Divides an angle into 2 congruent angles. |
| vertical angles | 2 angles that share a vertex and are directly across the vertex from each other. |
| straight angle | An angle formed by 2 opposite rays. |
| Linear Pairs Postulate | 2 angles that form a linear pair are supplementary. |
| ray AB |  |
| Angle ABC |  |
| Measure of angle ABC |  |
