Hendecagon or a Undecagon.
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It is called Enneagon for eleven sides.
A polygon with eleven sides and corners is called a hendecagon. Occasionally, it may be referred to as an undecagon.
A polygon with 3 sides is called triangle A polygon with 4 sides is called quadrilateral A polygon with 5 sides is called pentagon A polygon with 6 sides is called hexagon A polygon with 7 sides is called heptagon A polygon with 8 sides is called octagon
A polygon with 7 sides is called a heptagon.
The polygon that has 6 sides is called a hexagon