Tessellation

Tessellation

Definition of tessellation: Tessellation is a group of polygons closely fitted together in a repeated pattern without any gaps or overlapping. Here is an example:

Regular Pentagon	Irregular pentagon
(Salzman, L., (1990).  Cool Tessellations.  Creative activities that make math and science fun for kids!  P6-7)

Vocabulary / glossary
Vertice:	When 2 or more straight lines meet to create a corner.
Angle:	The amount of turn between 2 straight lines that have a common end point.
Irregular polygon:	An irregular polygon is a shape with unequal sides such as a rectangle, quadrilateral and many more.
Regular polygon:	A regular polygon has equal sides and is the same length such as a square, a triangle and a pentagon.

Reference:
Definition of tessellation	https://www.mathsisfun.com/definitions/tessellation.html
Vocabulary / glossary	Vertice:  https://www.mathsisfun.com/geometry/vertices-faces-edges.html Angle:  https://www.mathsisfun.com/definitions/angle.html