Not sure what a decagonal is. Since the question refers to faces, edges and vertices, it may be assumed that the object in question is 3-dimensional. A decagon certainly is not, so decagonal cannot be a mistaken name for a decagon.
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2 faces, 4 edges, and 4 vertices 2 faces, 4 edges, and 4 vertices
Vertices: 12 Edges: 30 Faces: 20
A cylinder has 3 faces, no vertices and 2 edges.
Three faces, two edges and 0 vertices.
Three faces, two edges and 0 vertices.