2 tetrahedra.
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According to Euler none; for all 3d shapes: Vertices + Faces = Edges + 2 ⇒ 12 + 8 = 19 + 2 ⇒ 20 = 21 So unless 20 does equal 21, no 3d shape has 8 faces, 19 edges and 12 vertices. Any 3d shape with 8 faces would be an octahedron.
An ellipsoid with a slice removed.
# of faces + # of edges + # of vertecies + 2
A hexagon has 6 sides, which means it has 6 vertices as well. All 2-D objects have only one face.
A cube and a regular octahedron have the same number of edges, vertices, and faces. Both have 12 edges, 8 vertices, and 6 faces.