If you are thinking of Wyoming and Colorado you are wrong. They are very close to rectangular, but perfection is altogether a different thing!
Going eastward, Wyoming's northern edge dips south about 3 miles West of route 89 and then moves back up north just west of South Buffalo Plateau. Therefore not a perfect rectangle.
Colorado's southern border has a similar dip around 2 miles west of Crowley Peak so again, not a perfect rectangle.
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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.
a rectangular prism
Colorado and wyoming
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.