The name of a 20 sided polygon is Icosagon.
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20.
Duodecagon <--wrong... a duodecagon is a 12-sided polygon. icosagon is a 20 sided polygon.
A 20-sided polygon is an icosagon.(see related link)
The name of a 20 sided polygon is Icosagon.
A 20-sided polygon is called an icosagon.