Having students make a foldable like this is a great way for them to better understand angle relationships in geometry. This is really awesome to have them think about angle relationships even more.
Interactive notebook pages for reflections and rotations in high school geometry
interactive notebook lessons and foldables for angles and angle pair relationships
Parallel Lines with Transversals Foldable - an interactive notebook page idea for geometry
Guided math- Hands-on activities to teach angles