Trigonometry Hexaflexagons take foldables to a new level. Students have much of what they need to know about trig at their fingertips in a fun hexagon shape that reveals an inner layer. Watch Vi Hart's Hexaflexagons video https://youtu.be/VIVIegSt81k when you have a few hours to kill. (They lead you into other wonderful videos by her.)
I designed this with my pre-calculus classes in mind. Reference angles, values of the sine, cosine, and tangent of 30, 45, and 60 degree angles are included. Reciprocal, Quotient, and Pythagorean Identities are at student fingertips as well as other helpful relationships.