# What is a 13-sided polygon?

a 13 sided polygon is called a Tridecagon

A 13 sided polygon is called a Tridecagon also a Triskaidecagon.

### What is a complex polygon?

A polygon can be convex, which means Convex Polygon: A polygon that has all interior angles less than 180° Concave Polygon A polygon that has one or more interior angles greater than 180° A Complex polygon is neither convex or concave. A star polygon is an example of a complex polygon. If you look in google images, there are tons of pics of them.