feficagon
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A pentadecagon, though I prefer 15-gon. Everyone knows what that means without reference to a dictionary.
The name of a 15 sided polygon is Pentadecagon.
icosihenagon= 21-sided polygon icosihenagon= 21-sided polygon
A 15-sided polygon is called a pentadecagon or a pentakaidecagon.
The name of a 15 sided polygon is Pentadecagon.
There are 90 diagonals in a 15-sided polygon.
The name of a sided polygon is Octaconpentagon.
A pentadecagon. Although I prefer 15-gon since it is obvious what that means!
A 15 sided polygon can be called either a pentadecagon or a quindecagon.
The name of a 18 sided polygon is Octadecagon.
The name of a 8 sided polygon is Octagon.
A 10-sided polygon is called a decagon.
The name of a 33 sided polygon is riacontakaitrigon.