Matching Pairs Review of PolygonsOnline version Review number of sides in polygons by Sarah MCMILLON 1 Pentagon 2 Nonagon 3 Triangle 4 Quadrilateral 5 Octagon 6 Decagon 7 Hexagon 8 Heptagon 9 Sides 6 Sides 10 Sides 4 Sides 8 Sides 3 Sides 5 Sides 7 Sides