What is a Transversal?

There are two parallel lines intersected by one straight line, what's that one line called? A transversal. There are a few more things to know about transversal lines and the angles they create. What are vertical angles? Are they congruent? What are corresponding angles? Are they congruent? How many acute angles are there? Are they all congruent to each other? How many obtuse angles are there? Are they all congruent to each other? So many questions. If you want to know the answers, watch this video.