Triangle? Or shape In general? I'm going for it's a hectagon
A twenty sided polygon is called an icosagon - from the Greek words "icosi", meaning twenty, and "gonus", meaning angle, or knee.
Icosagon is a 20 sided figure.
sphere
Hexacontakaidigon
The name of a 21 sided polygon is Icosihenagon.
a 24 sided polygon is a icosikaitera.
The name of a 29 sided polygon is Icosikaienneagon.
The name of a 22 sided polygon is Icosidigon.
The name of a 22 sided polygon is Icosidigon.
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Dodecahedron