An octagonal based pyramid has 9 faces
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A triangular prism.
Triangular Prism Triangular Prism 5 faces, 9 edges 6 vertices
A nine sided plane figure is a nonagon. A nine sided three dimensional figure is a nonahedron.
Three of them which are 9, 0 and 9
A triangular prism - if the three rectangular face are not ALL the faces.