A prism with an n-sided base will have 2n vertices, n + 2 faces, and 3n edges.
15 edges
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A Platonic solid is a regular, convex polyhedron. The same amount of edges must meet at each vertex, all the faces need to be uniform, and all the dihedral angles must be the same.
VERTEX
A pyramid
Polyhedron is a geometric solid in three dimensions with flat faces and straight edges.
Yes. I think of an edge as a line. The edges meet at vertices, and the faces meet at edges.