An 11 sided figure is called a hendecagon, an undecagon, or a 11-gon.
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An eight sided figure is called an octagon.
A two-dimensional eleven-sided figure is called a hendecagon.
A 5-sided figure is called a pentagon.
A six sided figure is called a hexagon, as "hex" means "six."
A 1000-sided regular polygon is called a chiliagon.