Students will learn what the double and half angle formulas are, how to prove them, and how to use them.
Concude by giving your students this challenge:
Cut Nets by NRICH: Have students pair the pieces by looking at the image. Then have students cut out the shapes, and tape them together, to see if they were right. If you allow students to cut out the shapes before pairing them, they will inevitably find pairs by trial-and-error, which is not the objective.
TODO: It would be nice if we had a larger version so it was easier to cut out the figures. It would also be nice if said image was in black-and-white, so that it was cheaper to print.