I read Sir Cumference and the Great Knight of Angleland by Cindy Neuschwander to the students. They drew a mural of the town in the story making acute and obtuse angles.
3D shapes and Euler's formula
We read Sir Cumference and the Sword and the Cone by Cindy Neuchwander and constructed 3D shapes with toothpicks, marshmallows, and gum drops. They also colored and constructed nets and build a town out of them.
This year I added the Angry Birds nets! I found it on Angry Birds.