It is length * width.
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For the same base dimensions (base area) and the same height, the rectangular prism has more surface area.
Given the surface area of a rectangular prism, there are infinitely many rectangular prisms possible.
surface area=(perimeter of base)x(height of the shape)+(area of the base)x(2)
Given any rectangular prism, there are infinitely many other rectangular prisms with exactly the same surface area.