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# Polygon

A **polygon** is a closed two-dimensional shape. It is also a simple curve that is made up of line segments. It usually has three sides/corners or more. It could also be referred to as 'A closed plane figure bound by three or more line segments'. It has a number of edges. These edges are connected by lines. A square is a polygon because it has four sides. The smallest possible polygon in a Euclidean geometry or "flat geometry" is the triangle, but on a sphere, there can be a digon. The monogon is a theoretical figure that cannot exist - it has only one side and one edge.

If the edges (lines of the polygon) do not intersect (cross each other), the polygon is called *simple*, otherwise it is *complex*.

In computer graphics, polygons (especially triangles) are often used to make graphics.

A simple concave hexagon

- Polygon face.jpg
How to make a face using polygons