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The question cannot be answered because it makes no sense. "Decagonal" is an adjective, not a noun and the answer will depend on whether the question is about a decagonal pyramid, a decagonal prism or decagonal bipyramid, or something else.

Q: How many vertices are in a decagonal?

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It depends on a decagonal what. A decagonal prism has 20 vertices. A decagonal pyramid has 11 vertices.

A decagonal based pyramid will have 11 faces, 11 vertices and 20 edges

11 vertices (one more than the number of vertices in the base).

12 faces 20 vertices 30 edges

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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It depends on a decagonal what. A decagonal prism has 20 vertices. A decagonal pyramid has 11 vertices.

A decagonal prism has 20 vertices: 10 at each end.

A decagonal prism has 20 vertices: 10 at each end.

20 vertices.

A decagonal based pyramid will have 11 faces, 11 vertices and 20 edges

11 vertices (one more than the number of vertices in the base).

Vertices: 20 Edges: 30 Faces: 12

By "corners", do you mean vertices or edges?

Edges = 30 Faces = 12 Vertices = 20

12 faces 20 vertices 30 edges

20 edges, 11 vertices (corners) and 11 faces.

11 faces and 11 corners (vertices).