If the prism is based on regular decagons and it is a right prism, all 12 faces.
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A decagonal based pyramid will have 11 faces, 11 vertices and 20 edges
It has 9 faces It has 21 edges Its end faces are parallel to each other
12 faces 20 vertices 30 edges
its has parallel faces and edges
12 faces * * * * * Correct as far as it goes, but incomplete. 20 vertices 30 edges