A hendecagon is an 11 sided polygon which can also be named as an undecagon and has interior angles that add up to 1620 degrees
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The hendecagon is a polygon with eleven sides.
A hendecagon (also undecagon) is a polygon with eleven edges and eleven angles.
The name of a 11 sided polygon is Hendecagon.
A hendecagon can have upto 5 pairs of parallel lines.
If one of the sides of the hendecagon must coincide with a side of the triangle, then there are 11 triangles with a interior point as a common vertex. Alternatively, there are 9 triangles with the same side of the hendecagon in each triangle. However, each of these triangles, for example, can be divided into two, and then they can be further divided. So the total number of triangles is any [large] number you like.