This week I asked students to create 3 2D shapes from those we have studied that are also the face of a 3D shape (square, rectangle, triangle). They created each of the shapes using the Geoboard app and named and added 1 attribute for each shape (in the Skitch app). They used this background in Tellagami and then told about the 3D shape(s) that had this type of face (no videos included here).
Next time I would also ask students to include infomration in their Tellagami about why I didn't ask them to make a circle on the geoboard. I would also have them list more attributes--I had thought the screen would get too crowded but that didn't seem to be an issue.