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Escherized Tessellation

What can you tell about this tessellation?[br]What motions move one tile onto its neighbor?[br]What is the underlying shape before it was modified? How do you know?
More GeoGebra at [url]mathhombre.blogspot.com[/url].[br]Base tessellation at [url]http://www.geogebratube.org/material/show/id/28859[/url]

Net for a Rectangular Prism

Fold, unfold, zoom and rotate the net for a rectangular prism.
Net for a Rectangular Prism

Sierpinski háromszög

Sierpinski háromszög

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