I made a template for them to take home:
This would allow them to cut various shapes in the right size. Then I "flipped" these 3 pages of notes:
See how the half circles pop up! That makes me so happy. Maybe you need a closer look:
And pages 3 and 4:
Now they can have a "forever" reference to a 3D model and not just see it in class one time when we introduce it.
Hopefully, this will lead to a clearer understanding in their heads.