A prism with an n-sided base will have 2n vertices, n + 2 faces, and 3n edges.
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Add up all of the lengths of the edges adjacent to one of the bases.
338
A prism with an n-sided base will have 2n vertices, n + 2 faces, and 3n edges. A pentagonal prism has 15 edges.
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.
Volume of rectangular prism: 5*5*20 = 500 cubic cm