National Museum of American History
Polyhedron Model by Martin Berman, Elongated Pentagonal Gyrobirotunda
Berman, Martin · 1970
The top and bottom faces of this model are regular pentagons. Pentagons, triangles and squares are on sides. The faces total twelve regular pentagons, twenty equilateral triangles, and ten squares. On Berman's models of regular-faced convex polyhedra, see 1978.1065.01.
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