A nonagon or enneagon.
Another answer:
An eleven sided figure is also called an hendecagon.
Chat with our AI personalities
the 11 sided polygon is undecagon
In geometry, a tridecagon (or triskaidecagon) is a 13-sided (and angled) polygon.
The name of a 11 sided polygon is Hendecagon.
The name of a 11 sided polygon is Hendecagon.
An 11 sided polygon has 44 diagonals.