Nonagon (nona- means nine).
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There are two different names commonly used for a 9 sided figure: a nonagon or, an enneagon.
The name of a tweleve sided shape is a dodecagon.
a twelve sided shape is called a dodecagon.
A Tetracontakaitetragon is a forty - five sided shape ...
The name of an eleven sided geometric shape is a Hendecagon or endecagon.