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 Description  
 Polygon:  A closed figure formed by three or more line segments.

The word "polygon" derives from the Greek words poly (many) and gonu (knee). So a polygon is a thing with many knees!

Polygons can be concave or convex. A few examples and nonexamples are given below:

The first figure is a concave irregular polygon, the second is a convex irregular polygon, and the third is a convex regular polygon. The circle is NOT a polygon because it is not made up of line segments. The last figure is NOT a polygon because it is not closed.