Number of sidesName3triangle or trigon4quadrilateral or tetragon5pentagon6hexagon7heptagon8octagon9enneagon10decagon11hendecagon12dodecagon13triskaidecagon or tridecagon14tetrakaidecagon or tetradecagon15pendedecagon16hexdecagon17heptdecagon18octdecagon19enneadecagon20icosagon
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