hectagon hectagon
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A 12 sided 3D shape is a dodecahedron.
A tridekahedron is a 3D 30 sided shape.
A 50-sided 3D shape is called a pentacontagon. It is a polygon with 50 sides and 50 angles. In three dimensions, it would be a polyhedron with 50 faces, 50 vertices, and 100 edges.
heptadecadon
tetrahedron