20
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Oh, dude, a prism with 20 vertices has 10 faces. Each face of the prism connects two of the vertices, so you gotta divide the total number of vertices by 2 to get the number of faces. Math can be pretty chill when you break it down like that.
A decagonal prism has 20 vertices: 10 at each end.
A pentagram is a five pointed star and has 10 vertices. So, a pentagram prism has 20 vertices. This is NOT the same as a pentagonal prism.
Vertices: 20 Edges: 30 Faces: 12
Vertices: 12 Edges: 30 Faces: 20