Euler can help you answer this question. Euler's formula says number of faces plus number of vertices minus the number of edges equal 2. In symbols we write F+V-E=2. So in this
case we have 10+12-E=2
So E=20 and there are twenty edges.
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3 faces, 2 edges, and no vertices
4 faces, 6 edges, 4 verticesFour faces, six edges and four vertices.
Faces: 10 Vertices: 16 Edges: 24
8 vertices,12 edges,and 6 faces
3 faces, no vertices, 2 edges.