You count the number of vertices in the polygon that forms the base. The prism has twice as many vertices.
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You can count them or you can remember this rule: A prism with an n-sided base will have 2n vertices, n + 2 faces, and 3n edges. A rectangular prism has 8 vertices.
faces= 10 vertices-=26 edges=17 * * * * * Wrong on each count! Faces: 8 Edges: 18 Vertices: 12
An octagonal prism has 16 vertices
A prism with 9 faces is a heptagonal prism. That has 14 vertices.
A rectangular prism has 8 vertices/corners.