An undecagon has eleven sides. That means that it has more sides than a decagon and fewer sides than a dodecagon.
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There are 11 triangles in an undecagon. The number of sides of a polygon is the number of triangles it has.
Hendecagon or undecagon
A polygon with 11 sides is called an "undecagon."
Endecagon or hendecagon.An undecagon has 11 sides
undecagon has 43 diagonals (answer by erwin handsome)