it is 19
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There are 30 edges on a decagonal prism.
30
20
It has 11. There are the 10 sides (decagonal) and then the base. So 11 total.
Vertices: 20 Edges: 30 Faces: 12
Edges = 30 Faces = 12 Vertices = 20
12 faces 20 vertices 30 edges
19 * * * * * Actually it is 30 edges. Ten around each of the decagonal faces, and ten more connecting the corresponding vertices of the two decagons.
A decagonal prism has 12 faces
If the prism is based on regular decagons and it is a right prism, all 12 faces.
A decagonal prism has 20 vertices: 10 at each end.
A decagonal prism has 20 vertices: 10 at each end.