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In geometry, a tridecagon (or triskaidecagon) is a 13-sided (and angled) polygon.
A nonagon or enneagon.Another answer:An eleven sided figure is also called an hendecagon.
11
Some examples are: 5 sided polygon is a pentagon, 6 sided polygon is an hexagon and an 8 sided polygon is an octagon
A hexagon is a six-sided polygon. A four-sided polygon is a quadrilateral, quadrangle, or tetragon.