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 51 sided polygon is Pentaconhenagon. The name of a 52 sided polygon is Pentacondigon. The name of a 53 sided polygon is Pentacontrigon. The name of a 54 sided polygon is Pentacontetragon. The name of a 55 sided polygon is Pentaconpentagon. The name of a 56 sided polygon is Pentaconheptagon. The name of a 57 sided polygon is Pentaconhexagon. The name of a 58 sided polygon is Pentaconoctagon. The name of a 59 sided polygon is Pentaconenneagon.
The name of a 12 sided polygon is Dodecagon.
A 8 sided polygon is called a octagon.
A 30 sided polygon contains 28 triangles.
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 51 sided polygon is Pentaconhenagon. The name of a 52 sided polygon is Pentacondigon. The name of a 53 sided polygon is Pentacontrigon. The name of a 54 sided polygon is Pentacontetragon. The name of a 55 sided polygon is Pentaconpentagon. The name of a 56 sided polygon is Pentaconheptagon. The name of a 57 sided polygon is Pentaconhexagon. The name of a 58 sided polygon is Pentaconoctagon. The name of a 59 sided polygon is Pentaconenneagon.
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 19 sided polygon is enneadecagon.
The name of a 15 sided polygon is Pentadecagon.
The name of a 7 sided polygon is Heptagon.
The name of a 200 sided polygon is dihectagon.