Why are alternate exterior angles congruent?

1 Answer
Zor Shekhtman
Jan 29, 2016

Because they are vertical (and, therefore, congruent) to corresponding interior alternate angles, which have been proven to be congruent between themselves.

Explanation:

For complete explanation, theorems and proofs related to parallel lines and transversal we can recommend to refer to UNIZOR and follow the menu options Geometry - Parallel Lines - Introduction.

Related questions
See all questions in Angles Between Intersecting and Parallel Lines
Impact of this question
4306 views around the world
You can reuse this answer
Creative Commons License