This question is from Chris a homeschooler in California. His question is about parallel lines and transversals. Parallel lines and transversals form many angle relationships that all geometry students need to understand. In this problem the angles I will be talking about are alternate interior angles. However, like I was saying there are many angle relationships in a parallel line / transverval problems. Check out my lessons on these topics by going to my chapter on Parallel and Perpendicular Lines.