Help your students understand proof fundamentals using this set of 36 printable flash cards designed for the beginning chapters of a high-school Geometry course. These cards review essential theorems and definitions that students must master early on, including the Vertical Angles Congruence Theorem, the Linear Pair Postulate, and important vocabulary words such as congruent angles, midpoint, and more. Cards are formatted to be printed back-to-back along the short edge. Some copiers defaul