As a math teacher, I love these things. In a calculus class, I once gave a demonstration and then derived the parametric equations on the board. In an introdu

As a math teacher, I love these things. In a calculus class, I once gave a demonstration and then derived the parametric equations on the board. In an introductory number theory class, I tasked my students with figuring out how to predict how many points a figure would have before drawing it.