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Triangles.A triangular prism has two triangles joined by rectangles while a rectangular prism has two rectangles joined by rectangles.
There are two pentagons and five rectangles.
That they are plane shapes - usually rectangles. They have a length and a width (or height) but no physical depth.
a rectangular prism
Rectangles must always have 4 sides. As there are two rectangles, there must be 8 sides. However, if these two rectangles have identical sized sides and they are placed against each other so that they look like one rectangle, there will only be 4 sides.