The last session I attended on Thursday afternoon at NCtM last week was with Erin Schneider from a
Louisville, KY. Several hands-on and open ended tasks, sharing and talking.
The hinged mirrors were fun to play with and I wondered how I could use them in my classroom.
The hinge is placed either off the edge of a sheet of paper or on the edge of a paper.
Convince me its a square.
What happens as the central angle gets smaller? Larger?
For my students, I feel this allows them to really see a polygon diseected into several triangles from the central angle.