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.
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A prism with 20 vertices would have 12 faces. In a prism, there are two faces at each end and the other faces are parallelograms. The formula for the number of faces in a prism is F = 2 + n, where n is the number of vertices. So, for a prism with 20 vertices, it would have 2 + 20 = 22 faces.
A prism with an n-sided base will have 2n vertices, n + 2 faces, and 3n edges.
12 faces
Vertices: 20 Edges: 30 Faces: 12
A decagonal prism has 20 vertices: 10 at each end.
20
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: 12 Edges: 30 Faces: 20