A 12 sided 3D shape is called a dodecahedron.
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An 11-sided 3D shape is a hendecahedron.
A 3D 5 sided shape is called a dodecahedron. It is a solid with 20 vertices, 30 edges and 12 equal pentagonal triangular faces.
A dodecahedron is a 3-d shape with 12 faces that are regular pentagons.
dodecahedron
Dodecahedron