This is a set of flashcards for students to practice identifying the polygons triangle, square, pentagon, hexagon, hectogon, octagon, nonagon, decagon, hendecagon, dodecagon, tridecagon, tetradecagon, pentadecagon, hexadecagon, heptadecagon, octadecagon, enneadecagon, and icosagon (polygon shapes with up to twenty sides). This set can be used as flashcards or as a memory game.