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This video discusses the proof that if opposite sides of a quadrilateral are congruent, then it is parallelogram. It explains the different ways of proving parallelogra. In this video geometry lesson, i prove two parallelogram theorems.
Learn this proposition with interactive stepbystep here. Learn how to prove a figure is parallelogram in the coordinate plane. This geometry video tutorial provides a basic introduction into two column proofs with parallelograms.