http://www.shodor.org/interactivate/dictionary/p.html#parallelogram
E-Example 5.3: Exploring Properties of Rectangles and Parallelograms
http://www.math.com/school/subject3/lessons/S3U2L3GL.html
http://mathworld.wolfram.com/Parallelogram.html
http://www.shodor.org/interactivate/discussions/parallelogram.html
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