It has 11. There are the 10 sides (decagonal) and then the base. So 11 total.
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If the prism is based on regular decagons and it is a right prism, all 12 faces.
12 faces 20 vertices 30 edges
A decagonal prism has 12 faces
A decagonal based pyramid will have 11 faces, 11 vertices and 20 edges
By definition, a dodecahedron must have twelve faces. So it must be an decagonal prism. Edges = 30 Faces = 12 Vertices = 20