10 sided 2D shape is called a decagon
20 sided 2D shape is called a icosagon
30 sided 2D shape is a swimming pool
40 sided 2D shape is unknown
50 sided 2D shape is unknown
60 sided 2d shape is unknown
70 sided 2d shape is unknown
80 sided 2d shape is unknown
90 sided 2d shape is unknown
100 sided 2d shape is unknown
110 sided 2d shape is unknown
111 sided 2d shape is unknown
120 sided 2d shape is unknown
130 sided 2d shape is unknown
A 20-sided polyhedron is an icosahedron. A 20-sided polygon is an icosagon.
A 20-sided shape is called a dodecahedron.
you call a seven sided shape a heptagon.
An 11 sided shape is an Eptogon
A 12-sided shape is called a dodecagon.
A 30 sided shape is called a Triacontagon.
An icosagon is the name of the 20 sided polygon.
Icosahedron is a 20 sided polygon.
the name of a 20 sided 3d shape is called a icosahedron
Any of these shapes is practically circular. A 20-sided shape is an icosagon. a 50-sided shape is a pentacontagon (aka pentecontagon). A 100-sided shape is a hectogon (aka hecatontagon). A 1000-sided shape is a chiliagon.
A 60 sided shape is called a hexaconta. The hex prefix means 6 and the conta suffix is used for polygons with 20 to 100 sides.
A nine sided shape or polygon is called a nonagon.