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A regular hendecagon is a hendecagon which is both equilateral and equiangular.
That is, a regular polygon with $11$ sides.
That is, a hendecagon in which all the sides are the same length, and all the vertices have the same angle:
Also known as
A regular hendecagon can also be referred to as a regular undecagon.
Some sources give it as regular endecagon.
The word hendecagon derives from the Greek hendeka, meaning eleven, and gon, deriving from the Greek for corner.
The word undecagon is a hybrid word whose first part derives from the Latin undecim, meaning eleven.
The word endecagon may be erroneous.