Yes. It is an 11-sided one.
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An hendecagon is an 11 sided polygon
A polygon having eleven sides can be called a hendecagon or an undecagon. It can also be called an 11-gon.
Hendecagon.
11 Undecagon, Hendecagon 12 Dodecagon 13 Tridecagon, Triskaidecagon 14 Tetradecagon, Tetrakaidecagon 15 Pentadecagon, Pentakaidecagon 16 Hexadecagon, Hexakaidecagon 17 Heptadecagon, Heptakaidecagon 18 Octadecagon, Octakaidecagon 19 Enneadecagon, Enneakaidecagon 20 Icosagon
11