20 edges, 11 vertices (corners) and 11 faces.
Decahedron. * * * * * Or a hendecagonal pyramid or a decagonal prism or a cuboid with six corners chopped off or many other possibilities.
20 faces and 10 sides
10 I think? * * * * * Sorry, but you think wrong. There are 20.
Twenty edges
11 faces and 11 corners (vertices).
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.
20 edges, 11 vertices (corners) and 11 faces.
It depends on a decagonal what. A decagonal prism has 20 vertices. A decagonal pyramid has 11 vertices.
Decahedron. * * * * * Or a hendecagonal pyramid or a decagonal prism or a cuboid with six corners chopped off or many other possibilities.
It depends on a decagonal what. There will be different answers for a decagonal pyramid, prism, dipyramid, etc.
It has 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.
20 faces and 10 sides
A decagonal based pyramid will have 11 faces, 11 vertices and 20 edges
A pyramid has.
No. 11 sides.