If you wish to communicate information, I suggest you call it an 15-gon. Although there is a prefix for 15 (pentadeca-) I suggest you keep it simple. Not only is the use of long Greek prefices pretentious, you will only annoy the reader who will probably have to consult a dictionary. Having said that, if you do want to be pretentious or obfuscate, you can use the link below for polygons with up to 999 sides. http://faculty.kutztown.edu/schaeffe/Tutorials/General/Polygons.html
A shape's sides are called faces.
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 15 sided shape is called a Pentadecagon, or a Pentakaidecagon.
icosahedron
A shape's sides are called faces.
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 15 sided shape is called a Pentadecagon, or a Pentakaidecagon.- thanks a million Chrissy . B -
A shape that has 11 sides is called a hendecagon.
icosikaienneagon
A nonagon
An octagon
A 15 sided shape is called a Pentadecagon, or a Pentakaidecagon.
A nine sided shape is called a nonagon.
icosahedron
a line