This strikes me as a nice kick-off to an early unit in Geometry. Ryan Brown offers a nice introduction to polygons using a do-it-yourself Polygraph activity. Here are the goods that I’ve found looking through the searchable offerings on Desmos. It’s been about 14 months since I last taught Geometry, but that hasn’t kept me from keeping a keen eye out for high-quality activities to add to My Geometry Course.

If you give any of these a try, please let me know how they go. This is a very robust activity (36 slides), so time might become an issue, but depending on how you run it, I feel like there’s a ton of value embedded in the different learning activities.

Rothe – This one is particularly handy because my unit on dilations and scale factor wasn’t my favorite. Check this activity out and then daydream about all the outstanding vocabulary the students would be forced to use while competing with each other. Transformation Polygraph by Julia Finneyfrock – Seriously. Due to the algebraic nature of proving this parallel, parallelograms are a nice target for a Desmos activity. Parallelograms in the Coordinate Plane by Jared – This one asks some very interesting questions and has a nice format in which to do it. So, I’m adding them. All three are Desmos activities. I’ve noticed some excellent learning experiences that my geometry course has been missing. That’s what community will do for you and the innovative math community more than takes care of people.

Little by little it’s becoming more of a curated set of links that make me wish I still had a classroom. It isn’t really my geometry course anymore.

Desmos graph letter art