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undecagon has 43 diagonals (answer by erwin handsome)
There are 11 triangles in an undecagon. The number of sides of a polygon is the number of triangles it has.
An undecagon has eleven sides. That means that it has more sides than a decagon and fewer sides than a dodecagon.
A undecagon has 44 diagonals. A dodecagon has 54 diagonals. An octagon has 20 diagonals. A heptagon has 14 diagonals.
There are 44 diagonals in an 11 sided undecagon