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A prism with an n-sided base will have 2n vertices, n + 2 faces, and 3n edges. 7 faces
A polygon has the same amount of vertices as it does sides, so it would have 7 vertices.
faces= seven edges=fifteen vertices=ten
A pentagonal prism has 7 faces, 10 vertices and 15 edges.
A heptagon has 7 sides and 7 vertices.