dodecagon
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NO!
That is 12 sides. 11 sides is a hendecagon.
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A geometric shape that has 11 sides is called a "hendecagon" or "undecagon." Both terms are acceptable.
hendecagon
Endecagon or hendecagon.An undecagon has 11 sides
Hendecagon.
A polygon having eleven sides can be called a hendecagon or an undecagon. It can also be called an 11-gon.