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
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.
It depends on a decagonal what. There will be different answers for a decagonal pyramid, prism, dipyramid, etc.
A pyramid has one more corner and faces than the number of sides in its base; thus a decagonal pyramid has 10 + 1 = 11 faces and corners. A pyramid has twice as many edges as sides in its base; thus a decagonal pyramid has 2 X 10 = 20 edges.
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
By "corners", do you mean vertices or edges?
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.
20 edges, 11 vertices (corners) and 11 faces.
11 faces and 11 corners (vertices).
A decagonal prism has 20 vertices: 10 at each end.
A decagonal prism has 20 vertices: 10 at each end.
20 vertices.
It depends on a decagonal what. There will be different answers for a decagonal pyramid, prism, dipyramid, etc.
Vertices: 20 Edges: 30 Faces: 12
A pyramid has one more corner and faces than the number of sides in its base; thus a decagonal pyramid has 10 + 1 = 11 faces and corners. A pyramid has twice as many edges as sides in its base; thus a decagonal pyramid has 2 X 10 = 20 edges.