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How Many Diagonals Does A Pentagonal Prism Have?

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Oddman answered
From each vertex, N-4 diagonals can be drawn, where N is the number of vertices. The total number of diagonals in a prism will be N(N-4)/2, where N is the number of vertices.
For N=10 (a pentagonal prism), the number of diagonals is (10)(6)/2 = 30.

Half of them are space diagonals.

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