Jim Doherty, @mrdardy, got us started this morning with a good question: Ideas for a smart #geogebra activity to show that parallel pop sides in a quad forces equal length? Here's his sweet result. [url]http://www.geogebratube.org/material/show/id/122582[/url] I missed a lot of the discussion, but had to make one when I came back.
More GeoGebra at [url]mathhombre.blogspot.com/p/geogebra.html[/url]