Fantastic.

Spirograph – @geogebra Tube bit.ly/XkaDL4 full frontal trochoid features. Maybe purges the obsession.

— John Golden (@mathhombre) February 6, 2013

Questions for students:

• What’s with that fraction on the left side? What does that do?
• How do I get a graph with 7 “arms”?
• What is a the graph with 2 arms called?
• How many circuits do I need to finish the shape if my fraction is 25/60?

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