What is not a waste is ensuring that students comprehend and can use automatically the basics of math so that when their brains are ready for algebra, geometry and calculus, the ability to understand is implanted and ready to go.
Judi Buenaflor; Allentown, Pa
This page shows examples of parallel lines cut by a transversal (alt int angles, alt ext angles, etc). Will help students to prove parallel lines given these known angles.