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hendecagon

dodecagon

tridecagon

tetradecagon

pentadecagon

hexadecagon

heptadecagon

octadecagon

enneadecagon

icosagon

The name of a twenty-sided polygon is an icosagon. The definition of an icosagon is a twenty-sided polygon. You can find many lovely pictures online, none of which can be reproduced here.

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10y ago
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Q: What is the name of 11 12 13 14 15 16 17 18 19 20 sided polygon and their picture and definition?
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