The name of a 15 sided polygon is Pentadecagon.
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The name of a 15 sided polygon is Pentadecagon.
A 15-sided polygon is called a pentadecagon or a pentakaidecagon.
The name of a 12 sided polygon is Dodecagon.
A 8 sided polygon is called a octagon.
A 15 sided polygon can be called either a pentadecagon or a quindecagon.