a quadrilateral
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An eight sided figure is called an octagon.
That's called a closed figure.That's called a closed figure.That's called a closed figure.That's called a closed figure.
An 11 sided figure is called a hendecagon, an undecagon, or a 11-gon.
A six sided figure is called a hexagon, as "hex" means "six."
pentagon A pentagon. A 5-sided figure is called a pentagon. pentagon A five sided figure is called a pentagon