Polygons

A polygon (Greek for many sides) is a closed figure drawn in the plane using straight line segments which meet only at their endpoints.

Polygons are named according to their number of sides.

Name	Number of Sides
Triangle	3
Quadrilateral	4
Pentagon	5
Hexagon	6
Heptagon	7
Octagon	8
Nonagon	9
Decagon	10
Hendecagon (or Undecagon, or Unidecagon)	11
Dodecagon	12
n-gon	n

A regular polygon is one in which all interior angles are congruent and all sides are congruent; for example, an equilateral triangle, or a square.

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