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Polygons Classified by Number of Sides Name of Polygon 3 triangle 9 nonagon 4 quadrilateral 10 decagon 5 pentagon 11 11-gon or hendecagon 6 hexagon 12 dodecagon 7 heptagon 13 13-gon 8 octagon n n-gon Reflectional Symmetry: A figure has reflectional symmetry if and only if its reflected i...