A 15 sided shape is called a Pentadecagon, or a Pentakaidecagon.
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A 15-sided polygon is called a pentadecagon or a pentakaidecagon.
A 15 sided polygon can be called either a pentadecagon or a quindecagon.
Providing that it is a regular 15 sided polygon then each interior angle will be 156 degrees
Quindecagon or pentadecagona 15 sided pollygon is called a Pentadecagon, it has interior angles of 156 degrees each
A 15 sided polygon is called a ticosakiadecagon * * * * * A pentadecagon. Although I prefer 15-gon since it is obvious what that means!