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A rhombus has 4 vertices, therefore a rhombic prism has 4 x 2 = 8 vertices.
A truncated pyramid has: faces = number_of_edges_round_polygon_of_base + 2 vertices = number_of_edges_round_polygon_of_base x 2 edges = number_of_edges_round_polygon_of_base x 3
A pentacontagon has 50 vertices (not vertices's!).
16 vertices.16 vertices.16 vertices.16 vertices.
5 vertices