They are called endecagons or hendecagons.
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A two-dimensional eleven-sided figure is called a hendecagon.
An eleven sided shape 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.
A 2-dimensional figure with 12 sides is called a dodecagon. A 3-dimensional figure with 12 sides (faces) is called a dedecahedron.
deltaAnswerThere are several categories that meet this criteria:Among two dimensional shapes:Any regular polyhedron with an odd number of sides will not have any parallel sidesAny circle oval or ellipseAny closed shape made of arcsCycloidFor three dimensional shapes: SpheresCones