This was created to help show that GeoGebra can be used to create presentations for the classroom. I certainly wish I had this when I was a classroom teacher!!
This particular one shows how a regular pentagon (equal sides, equal angles!) can be created from a square.
I will be talking about this and a lot about GeoGebra in general at my presentation at AMTNYS in Rochester (currently I am scheduled at 3:45 on Sept. 12. See you there!!