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An octagonal prism has 10 faces. The octagonal prism can be seen to have ended shaped like octagons. That's an 8-sided figure. is a 3-dimensional form, and if it has octagons on each end, it is going to have 8 faces. That's a face for each side of the octagon. The 8 faces of the "body of the prism are added to the two faces (one on each end) for a total of 10 faces.

(The illustration is a pentagonal prism.)

An n-gonal prism has n+2 faces.

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Q: How many faces does an octagonal prism have?
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