If the prism is a rectangular parallelepiped (that is, all the angles are right angles), just add the squares of the 3 dimensions (length, width, and height) together, and take the square root. This involves 2 applications of the Pythagorean Theorem.
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a rectangular prism is like a juice box
Rectangular prism has 3 more vertices than rectangular pyramid. Rectangular prism has 8 vertices. Rectangular pyramid has 5 vertices.
The answer depends on their relative dimensions.
A pentagonal prism has 10 vertices. A rectangular prism has 8 vertices. Therefore, a pentagonal prism has 2 more vertices than a rectangular prism.