Tessellation

Tessellation
A tessellation is a pattern that covers a plane by transforming the same figure or set of figures so that there are no overlapping or empty spaces.

Naming Tessellations:
A vertex is just a "corner point." 

There are four polygons, and each has four sides. So this tessellation is called "4.4.4.4"

Three hexagons meet at this vertex, and a hexagon has 6 sides. So this is called a "6.6.6" tessellation.

A tessellation of triangles has six polygons surrounding a vertex, and each of them has three sides. So this is called a "3.3.3.3.3.3".

Here is a video on how to create a tessellation:
@http://www.youtube.com/watch?v=_Lg19NvW_sU