Proving Quadrilaterals are Parallelograms

We work with the converse of the theorems we learned in the last video to prove, or make sure, that quadrilaterals are parallelogram. I work through two algebraic examples and one two column proof. EXAMPLES AT 2:33 8:43 12:22 Find free review test, useful notes and more at http://www.mathplane.com/ If you'd like to make a donation to support my efforts look for the "Tip the Teacher" button on my channel's homepage    / profrobbob