**Basically, a tessellation is a way to tile a floor (that goes on forever) with shapes so that there is no overlapping and no gaps. Remember the last puzzle you put together? Well,** **that was a tessellation! The shapes were just really weird.**

Example: |

**We usually add a few more rules to make things interesting!**

**REGULAR TESSELLATIONS:**

__RULE #1__: The tessellation must tile a floor (that goes on forever) with no overlapping or gaps.__RULE #2__: The tiles must be regular polygons - and all the same.__RULE #3__: Each*vertex*must look the same.

What's a vertex? | where all the "corners" meet! |

**What can we tessellate using these rules?**

**Triangles? Yep!**

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**Notice what happens at each vertex!**

**The interior angle of each equilateral triangle is 60 degrees.....60 + 60 + 60 + 60 + 60 + 60 = 360 degrees**