Poly was the source of the clip art to the left, and provided the peel I used for the model on the left below.
Finding the unknown height of my 30 cm square pyramid was just a warm up for finding the radius for making the threefold networks needed for my wiggly polygons. Below are two stages of my templates showing how to begin the net with a single center line, and demonstrating that the height of the triangle made by the points equals three times the radius of the circle that makes it. The two arc wiggle is another level of challenge, and I still have to cut these out and piece together the side templates. I will use the 30 cm one to make the top-bottom template first.