What are Polygons?

A polygon is a two-dimensional closed figure made up of only line segments.

 

For example:

This is a polygon. (as it is closed and made up of only line segments)

This is not a polygon. (as it is not made up of only line segments)

This is not a polygon. (as it is not closed)

 

Polygons are classified according to the number of sides they have:

 

Number of Sides	Name of the Polygon
3	Triangle
4	Quadrilateral
5	Pentagon
6	Hexagon
7	Heptagon
8	Octagon
9	Nonagon
10	Decagon