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13 sides: Triskaidecagon

14 sides: Tetrakaidecagon

15 sides: Pentakaidecagon

16 sides: Hexakaidecagon

17 sides: Heptakaidecagon

18 sides: Octakaidecagon

19 sides: Enneakaidecagon

20 sides: Icosagon

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14y ago

What else can I help you with?