An eleven sided shape is called a hendecagon.
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A polygon having eleven sides can be called a hendecagon or an undecagon. It can also be called an 11-gon.
A two-dimensional eleven-sided figure is called a hendecagon.
It is an undecagon which has 11 sides. Eleven sided shapes are usually called hendecagons, which uses the greek for eleven - Hendeka and corner -gon. However they can also be termed as undecagons or unidecagons.
Hendecagon or undecagon
a shape with equal sides