There are 10 parallel lateral edges. And ten parallel edges between the two bases.
There could be more - within each decagon, but that depends on the decagons, and details of these are not given.
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There are 30 edges on a decagonal prism.
A decagonal prism has 20 vertices: 10 at each end.
i think there is 12 faces are in the decagonal prism this is mhel a decagonal prism has 11 faces
5 pairs of parallel lines, plus a set of 5 parallels.
30