Escher-like Tessellations: Parallelogram Translations

In the interactive figure, drag the points on the sides of the parallelogram. [br]Opposite sides of the parallelogram are related by a translation.[br]As you drag the points, what do you notice?[br][br][b][color=#0000ff]To RESET the interactive worksheet and start over again, click on the small rotating arrows in the upper right corner of the interactive window.[/color][/b]
Things to think about...
[list][*]What happens when you drag point A to point C?[br][/*][*]What happens when you drag point B to point D?[/*][/list]

Informação: Escher-like Tessellations: Parallelogram Translations