Polygon
A closed plane figure for which all sides are line segments. The name of a polygon describes the number of sides. A polygon which has all sides mutually congruent and all angles mutually congruent is called a regular polygon.
Number of sides  Polygon name 

3  triangle  
4  quadrilateral  
5  pentagon  
6  hexagon  
7  heptagon  
8  octagon  
9  nonagon  
10  decagon  
11  undecagon  
12  dodecagon  
n  ngon  
See also
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