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Assuming a regular decagon is the base of the prism, it would be 10 faces.

With an irregular decagon, it is possible that two (or more) of the edges of the decagons are perpendicular, so all 12 faces could have perpendicular edges.

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Q: How many faces have perpendicular edges in a decagonal based prism?
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Related questions

How many faces vertices and edges does a decagonal pyramid have?

A decagonal based pyramid will have 11 faces, 11 vertices and 20 edges


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If the prism is based on regular decagons and it is a right prism, all 12 faces.


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How many faces have perpendicular edges in an heptagonal based prism?

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