It is called a hendecagon, undecagon
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A hendecagon or an undecagon is the name of a polygon which has eleven sides.
The name of a 11 sided polygon is Hendecagon.
A hendecagon (also undecagon) is a polygon with eleven edges and eleven angles.
An eleven sided polygon (2D shape with straight sides) is called a Hendecagon.I often set this as a research puzzle for my mathematics classes!
the side of a polygon is 6