A tessellation is an arrangement of closed shapes that completely cover the plane without ovelapping and without leaving gaps.When a tessellation uses only one shape , it is called a pure tessellation or regular tessellation
A pure tessellation must follow the following rules
rule1 The tessellation must tile a floor without overlapping or gaps
rule2 The tiles must be a regular polygon and all must be same
rule3 Each vertex i.e. where the corners of the polygons meet must look identical
For more details :-http://www.coolmath.com/tesspag1.htm
A tessellation in which more than one polygons are used is a semiregular tessellation.
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