When two lines cross each other, they form four angles. Any two angles sharing a ray, line segment or line are adjacent. In the following … See more

In our same drawing above, angles that skip an angle, that is, angles that are not touching each other except at their vertex, are vertical angles. … See more

Those same parallel lines and their transversal create exterior angles. An exterior angle among line constructions (not polygons) is one … See more

Anytime a transversal crosses two other lines, we get corresponding angles. The more restrictive our intersecting lines get, the more restrictive are their angle relationships. When a line crosses two parallel lines (a transversal), a whole new level of angle … See more