Pentagonal Prism ClipArt ETC

For example, if a prism has this number of faces, edges, and vertices, and you stretch the bottom, you can change it first to a. making it a heptahedron with 12 edges and 7 vertices; but a pentagonal prism has two bases and five sides, making it a heptahedron with 15 edges and 10 vertices. In both cases the formula works: V – E + F = 2 7.

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