This Quick sketch illustrates the relationships between angle pairs in parallel lines.[br]Credit for creating this activity goes to jelaw [url=https://www.geogebra.org/u/jelaw21]https://www.geogebra.org/u/jelaw21[br][/url]

Using the sketch above, identify [b]only one additional set[/b] of each angle pair. And also indicate of they are congruent or supplementary. As mundane as this exercise seems, it will be important in establishing the Triangle Sum Theorem which is a KEY theorem in Euclidean Geometry.