They are called hendecagons.
a shape with eleven sides is called a undecagon
They are called endecagons or hendecagons.
They are called sides or edges.
Shapes with straight sides are called polygons
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.
It is called Enneagon for eleven sides.
They are called heptagons.
A shape w/ 11 sides is called a hendecagon.
It is called a hendecagon.
Nonagons.
Hexagon.