1. two outside angles that lie on different sides of a transversal alternate exterior angles
2. lines that intersect and create right angles
exterior angles
3. lines that never cross one another and are the same distance apart at all times
alternate interior angles
4. two inside angles that lie on different sides of a transversal
transversals
5. lines that share one point
interior angles
6. two angles in the same position on different lines
parallel lines
7. lines that intersect two or more lines to create angles
intersecting lines
8. inside angles
perpendicular lines
9. outside angles
corresponding angles