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A rectangular prism has 6 faces.
A rectangular pyramid has 5 faces and a rectangular prism has 6 faces.
There are 6 faces in a rectangular prism.
The differnence is that a triangular prism has 5 faces and and rectangular prism had 4 faces.
A rectangular prism has 6 faces. A pentagon prism has 7 faces. Therefore a rectangular prism has one less face than a pentagonal prism.