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There are 9 edges in a (triangular) prism.
Other prisms have different number of edges.
It depends upon the cross-sectional shape of the prism.
If n is the number of sides to the cross-sectional shape of the prism, the number of edges is 3n.
A triangular prism has 3x3 = 9 edges
A rectangular prism (cuboid) has 3 x 4 = 12 edges
etc
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