Yes there is an eleven sided polygon.
It is known as a Undecagon or Hendecagon.
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An eleven-sided polygon is a hendecagon.
A nonagon or enneagon.Another answer:An eleven sided figure is also called an hendecagon.
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A 9 sided polygon is a Nonagon.
Some examples are: 5 sided polygon is a pentagon, 6 sided polygon is an hexagon and an 8 sided polygon is an octagon