The base of a rectangular prism is a rectangle. A rectangular prism, also known as a cuboid, has six faces that are all rectangles. The opposite faces are equal in area and shape. When we refer to the base of the prism, we typically talk about one of the two rectangular faces that are parallel to each other. Since both ends of the prism are rectangles, the base can be described as having length and width, with the height extending perpendicular to the base.
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