Quindecagon or Pendecagon
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A 15 sided shape is called a Pentadecagon, or a Pentakaidecagon.
The name of a tweleve sided shape is a dodecagon.
In Geometry a 15 sided shape is called a pendedecagon polygon with 15 angles and sides
In Geometry a 15 sided shape is called a pendedecagon polygon with 15 angles and sides
a twelve sided shape is called a dodecagon.