You'll be using Sketches 5 and 6 of this file to explore which coloured triangles could fit into the given triangle outlines. The intent of these two sketches is to make explicit comparisons between ...

Have students create triangles using Sketchpad. 5. Ask "How do you know that it is a triangle? "What's the same/different in our triangles?". You can also use the Trace feature to show examples of ...