I use this worksheet in my Geometry classes to replace a lecture: I start of class with a 15-minute mini-lesson that gives them the basics: definitions of complementary angles and supplementary angles, writing equations to represent them, supplements, complements, mnemonic devices to help them remember them, adjacent angles, acute, right, obtuse, straight, and reflex angles, definitions of equilateral, equiangular, and regular polygons, and transformations.
Then, I have them get to work on this