As a child, I always struggled with math, so I am always eager to find ways to connect art lessons with math. Many of the project I conduct with elementary students blend in components of geometry and fractions. Today, as I was fleshing out some ideas for a Google SketchUp collaboration, I found this site: http://www.mathopenref.com/
through this interactive page: http://www.mathopenref.com/coplanar.html
I am in love! I added this site link to the Slot Shelters website in the Collaborate section and will have links to each interactive definition for orbit, coplanar and non-coplanar, vector, congruent, perpendicular, tangent and angles.