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A decagonal prism is a three-dimensional geometric shape that has ten faces, two of which are decagons (10-sided polygons) and the rest are rectangular. All the faces are congruent to each other, meaning they have the same size and shape. The prism has 20 edges and 12 vertices.
A decagonal prism has 12 faces
It depends on a decagonal what. A decagonal prism has 20 vertices. A decagonal pyramid has 11 vertices.
It depends on a decagonal what. There will be different answers for a decagonal pyramid, prism, dipyramid, etc.
12
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.