A pentadecagon, although I prefer 15-gon.
A fifteen sided shape is called a pentadecagon.
A fifteen sided shape is called a pentadecagon. It is sometimes called a quindecagon or a pentakaidecagon.
pentadecagon
14 tetrakaideca 15 enneakaideca
The exterior angles of a 15 sided shape add up to 360 degrees
156 degrees
it is called a seven sided shape in Canada
The 22 sided shape is called a: ICOSIKAIDIGON
A 90 sided shape is called Enneacontagon.
Hommasquabblelagagon
A five-sided shape is called a pentagon.
A seven sided shape is called a heptagon.