A 20-sided polyhedron is an icosahedron. A 20-sided polygon is an icosagon.
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you call a seven sided shape a heptagon.
Icosahedron is a 20 sided polygon.
A 30 sided shape is called a Triacontagon.
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.
this shape is called a Pentacontagon