A nonagonal prism has eleven faces.
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Edges: 27 Faces: 11 Vertices: 18
Nonagonal is a prefix. A nonagon is a nine sided polygon. A nonagonal prism, is a prism.
There are 10 sides : 9 sides and the nonagonal base.
9
A prism with an n-sided base will have 2n vertices, n + 2 faces, and 3n edges. 18 base edges and 9 lateral edges