Assuming 'ventrices' is actually supposed to be vertices, the plural of vertex (alternately the plural can be written as vertexes), then a regular icosahedron has 12 vertices.
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The five regular polyhedra are Tetrahedron, Hexahedron(cube), octahedron, dodecahedron and Icosahedron.
Footballs are not all the same.One shape that was used for footballs is the truncated icosahedron. The shape has 12 regular pentagons and 20 regular hexagons. It has 32 faces, 60 vertices and 90 edges.Footballs are not all the same.One shape that was used for footballs is the truncated icosahedron. The shape has 12 regular pentagons and 20 regular hexagons. It has 32 faces, 60 vertices and 90 edges.Footballs are not all the same.One shape that was used for footballs is the truncated icosahedron. The shape has 12 regular pentagons and 20 regular hexagons. It has 32 faces, 60 vertices and 90 edges.Footballs are not all the same.One shape that was used for footballs is the truncated icosahedron. The shape has 12 regular pentagons and 20 regular hexagons. It has 32 faces, 60 vertices and 90 edges.
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Their faces are equilateral triangles.