SidesNamenN−gon3Triangle4Quadrilateral5Pentagon6Hexagon7Heptagon8Octagon10Decagon12DodecagonSidesName9Nonagon, Enneagon11Undecagon, Hendecagon13Tridecagon, Triskaidecagon14Tetradecagon, Tetrakaidecagon15Pentadecagon, Pentakaidecagon16Hexadecagon, Hexakaidecagon17Heptadecagon, Heptakaidecagon18Octadecagon, Octakaidecagon19Enneadecagon, Enneakaidecagon20Icosagon30Triacontagon40Tetracontagon50Pentacontagon60Hexacontagon70Heptacontagon80Octacontagon90Enneacontagon100Hectogon, Hecatontagon1,000Chiliagon10,000Myriagon