It is called a nonagon, a horrible mixture of Latin and Greek. For that reason it is (rarely) also called an enneagon
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For a nine side polygon its called a nonagon.For a nine side polygon its called a nonagon.For a nine side polygon its called a nonagon.
a nine sided polygon is called a nonagon.
An 8-sided polygon is called an octagon.
Nonagon
Pentadecagon, Quindecagon, PentakaidecagonA polygon with fifteen sides can be called a pentadecagon.