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 Quadrilateral:  A polygon with 4 sides.

Ask Dr. Math: Would you like to know the name of almost any polygon you can think of?

Polygons: Discussion of the definitions and properties of polygons as well as finding angle measures and areas.

Quadrilaterals: Read more about quadrilaterals.

A Study of Quadrilaterals: Learn more about quadrilaterals from regentsprep.org.