# polygon

A closed plane figure having straight sides. A polygon that has equal sides and equal angles is called a regular polygon. Examples: square, hexagon, nonagon, etc.

If the line connecting any two points on the polygon is always contained within the polygon then it is said to be a convex polygon. The sum of the interior angles of a convex polygon is \(180(n-2)\) degrees.

- [MLA] “polygon.”
*Platonic Realms Interactive Mathematics Encyclopedia.*Platonic Realms, 28 Mar 2013. Web. 28 Mar 2013. <http://platonicrealms.com/> - [APA] polygon (28 Mar 2013). Retrieved 28 Mar 2013 from the
*Platonic Realms Interactive Mathematics Encyclopedia:*http://platonicrealms.com/encyclopedia/polygon/