A polygon is a plane figure whose boundary is formed by straight lines. The simplest example is a triangle. A square, rectangle, kite, etc are common 4 sided polygons. Polygons can have angles that are greater than 180 degrees (reflex angles), so a 5 pointed star is a ten sided polygon. There is no limit to the number of sides a polygon can have.
If all the sides and angles of a polygon have the same measures, it is called a regular polygon.
hexagon
polegon
a polegon
A 12 sided polygon is a Dodecagon.