| A | B |
|---|
| Transversal | A line that crosses at least two other lines. |
| Adjacent Angles | Two angles in the same plane that share a common vertex and a common side, but have no common interior points. |
| Supplementary Angles | A pair of angles whose measues add up to 180 degrees. |
| Complementary Angles | Two angles whose measures add up to 90 degrees. |
| Exterior Angles | Angles outside of parallel lines. |
| Interior Angles | Angles inside of parallel lines. |
| Corresponding Angles | Pairs of angles in similar positions |
| Alternate Interior Angles | Pairs of interior angles on the opposite sides of a transversal. |
| Alternate Exterior Angles | Pairs of exterior angles on the opposite sides of a transversal. |
| Parallel Liness | Lines that do not intersect, or have any points in common, but are in the same plane. |
| Linear Pair | Adjacent, supplementary angles. |
| Right Angle | An angle with a measure of 90 degrees. |
| Obtuse Angle | An angle with a measure of more than 90 degrees and less than 180 degrees.. |
| Acute Angle | An angle with a measure of less than 90 degrees. |
| Straight Angle | An angle with with a meaure of 180 degrees. |
| Reflex Angle | An angle with a measure greater than 180 degrees and less than 360 degrees. |
