i think there is 12 faces are in the decagonal prism
this is mhel a decagonal prism has 11 faces
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A decagonal prism has two bases which are decagons and ten rectangular faces joining them. That is, 12 faces in all.
It has 2 bases and 12 faces
There are 30 edges on a decagonal prism.
A decagonal prism has 20 vertices: 10 at each end.
19 * * * * * Actually it is 30 edges. Ten around each of the decagonal faces, and ten more connecting the corresponding vertices of the two decagons.
30