Concave regular polyhedrons {Kepler-Poinsot concave solid} can be small stellated dodecahedron, great dodecahedron, or great icosahedron.
Concave regular polyhedrons can have 12 regular pentagons {great dodecahedron}.
Concave regular polyhedrons can have 20 equilateral triangles {great icosahedron}.
Concave regular polyhedrons can have 12 regular pentagons {small stellated dodecahedron}.
3-Geometry-Solid-Polyhedron-Kinds-Kepler-Poinsot
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Date Modified: 2022.0225