The name of a 11 sided polygon is Hendecagon.
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a nonagon is the name given to a nine sided polygon
The measure of the exterior angle of a 11-sided polygon = 360⁰/11 = 32 72/99⁰ = 32 8/11⁰
A regular Undegon (11 sided polygon) has 11 lines of symmetry. It also has an order of rotation symmetry of 11.
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