Who knows?
Well, maybe me....
I think it might be a decicosagon, because I figure that all polygons
from 21-30 end in icosagon, and because all the 13-20 begin with the 3-9 sided shape
names.. (apart from 19, with is the enneadecagon of course) the answer will be...
A. Decicosagon
A 30-sided polygon is called a triacontagon.
The name of a 12 sided polygon is Dodecagon.
A 8 sided polygon is called a octagon.
A 30 sided polygon contains 28 triangles.
A 30 sided polygon is called a Triacontagon.
I find the name "30-sided polygon", "40-sided polygon", etc. just fine.
A 30-sided polygon is called a triacontagon.
The name of a 12 sided polygon is Dodecagon.
A 8 sided polygon is called a octagon.
name of 4000 sided polygon
A 30 sided polygon contains 28 triangles.
A 30 sided polygon is called a Triacontagon.
The name of a 18 sided polygon is Octadecagon.
The name of a 99 sided polygon is enneacontaenneagon.
The name of a 8 sided polygon is Octagon.
The name of a 19 sided polygon is enneadecagon.
The name of a 15 sided polygon is Pentadecagon.