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Use informal arguments to establish facts about the angle sum and exterior angle of triangles, about the angles created when parallel lines are cut by a transversal, and the angle-angle criterion for similarity of triangles.
This activity walks students through how to prove lines are parallel.
Practice identifying supplementary, vertical, alternate interior, alternate exterior, corresponding, adjacent and consecutive angles.
Improve your math knowledge with free questions in "Proofs involving parallel lines" and thousands of other math skills.
First, I teach students the location of alternate interior, alternate exterior, corresponding, and same-side (consecutive) interior angles and the congruence theorems that go with them. Once students are comfortable with the theorems, we do parallel lines proofs the next day.
Videos, worksheets, games and activities to help PreCalculus students learn how to use the converse of the parallel lines theorem to prove that lines are parallel. What is the corresponding angle postulate? If two parallel lines are cut by a transversal then the pairs of corresponding angles are congruent. What is the corresponding angle converse?
Day 23: Intro to Proof / Proving Parallel Lines & Transversals ... - Desmos ... Loading...
