Proof - If both pairs of opposite sides are congruent -- parallelogram

Proof of if both pairs of opposite sides of a quadrilateral are congruent, then the quadrilateral is a parallelogram.

[@baileyb6022]

Thank you so much for teaching this and explaining it slowly! All of these videos have officially saved my math grade!

[@mal.324]

thank you so much

[@marcolsen5179]

In reason 5, should the reason be the theorem, if ANY two lines are cut by a transversal such that the alternate interior angles are congruent, THEN the lines are parallel? It looks like you are saying since the lines are parallel then the angles are congruent. Sorry for the clarification, you did a great job laying out the proof in a clear and straightforward way.

[@sanjayb0886]

Thank you, very well explained.

[@boejiden4190]

You just saved an 8th Grader from failing math PEPE SADGE

[@alphatoon-animation2534]

thank you to much you are a great teacher

[@ChicagoAngeljai19]

Good job explaining

[@JairaTravels]

thnx !! it really helps to do my homework :D

[@mulletinatransam]

Thanks. Totally helped me do my homework. Haha!

[@ChicagoAngeljai19]

Omg thanks cuz my teacher sucks. Lol