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12 faces, 30 edges and 20 vertices.

It has 2 decagons plus 10 rectangles between them giving 12 faces

It has 2 x 10 vertices on each decagon giving 20 vertices

It has 10 edges round each decagon plus another 10 joining the vertices of one decagon to the other decagon's vertices giving 2x10+10 = 30 vertices

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Q: How many faces sides and vertices does a decagonal prism have?
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