A polygon with 11 sides is called an "undecagon."
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apolygon is a shape that has no curves ,is closed, and has more then three sides
Hendecagon.
Endecagon (or hendecagon) and dodecagon.
dodecagon * * * * * NO! That is 12 sides. 11 sides is a hendecagon.
There is no specific term that distinguished between shapes with more than 11 sides from those with up to 11 sides.