This is a short but concise sets of notes on how to prove a quadrilateral is a parallelogram based on the five properties of parallelograms.

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I come from an Engineering background. When the housing market crashed and my job was at stake, I decided to make a career change to math education. This will conclude my fourth year in the teaching field. Courses that I have taught include Algebra 1, Geometry, Concepts of Problem Solving, Concepts of Algebra, Integrated Algebra, Accelerated Integrated Algebra, Integrated Algebra with Strategies,Integrated Algebra II, Integrated Algebra II with Strategies and Pre-Calculus.