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
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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.