It is called a hendecagon or, less often, an endecagon.
An eleven sided shape is called a hendecagon.
hendecagon
hendecagon
paralellogram
The name of a 11 sided polygon is Hendecagon.
Yes
A quadrangle is a shape with 4 angles, such as a square, rectangle, or paralellogram. A four sided shape is called a quadrilateral.
Two-dimensional: Pentagon Three-dimensional: Pentahedron
Square, rectangle, kite, paralellogram, etc.
A parallelogram belongs to the class of 4 sided quadrilaterals.
It is called either a Sidagon or an Undecagon.