Vertices: 20
Edges: 30
Faces: 12
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A decagonal prism has 20 vertices: 10 at each end.
20 edges, 11 vertices (corners) and 11 faces.
By "corners", do you mean vertices or edges?
A hexagonal prism has 18 edges and 12 vertices.
A triangular prism has 6 vertices and 9 edges.