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12 faces 20 vertices 30 edges
A triangular prism has 6 edges and so an octagonal prism will have 16 edges.
By definition, a dodecahedron must have twelve faces. So it must be an decagonal prism. Edges = 30 Faces = 12 Vertices = 20
A triangular prism has 9 edges!
A square prism has 12 edges.