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A parallelogram is a polygon with four sides (a quadrilateral). It has two pairs of parallel sides (sides which never meet) and four edges. The opposite sides of a parallelogram have the same length (they are equally long). The word "parallelogram" comes from the Greek word "parallelogrammon" (bounded by parallel lines). Rectangles, rhombuses, and squares are all parallelograms.
- [math]AE = CE[/math]
- [math]BE = DE.[/math]
In all Parallelogram's opposite angles are equal to each other. Angles which are not opposite in the Parallelogram will add up to 180 degrees.
- Opposite sides of parallelogram are parallel.
- Any line through the midpoint of a parallelogram bisects the area.
- Parallelogram is a quadrilateral.
- "Online Etymology Dictionary". etymonline.com. http://www.etymonline.com/index.php?search=parallelogram&searchmode=none. Retrieved 10 January 2011.