using euler formulae F+V-E=2
20+15-20=2
35-20=2
15=2
no it is not equal so
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A pentagonal prism has 7 faces, 10 vertices and 15 edges.
A pentagonal dipyramid (or bipyramid) has 15 edges, 10 faces and 7 vertices.
faces= seven edges=fifteen vertices=ten
6 faces 10 vertices 15 edges
I believe you intend to talk about a polyhedron if it is a convex polyhedron, there is a relation : F + V * E = 2 (you can experiment with current polyhedrons) the relation is not satisfied by your numbers