Given: Surface Area of Rectangular Prism, such that a rectangular prism exists & IS SO NO TO BE CONFUSED WITH A TRIANGULAR PRISM.
i) Since the Volume of a Rectangular Prism = r^3, the Surface Area of a Rectangular Prism is the anti-derative I believe, or to say it in layman's terms, the Integral of 1/4r^4.
ii) Therefore, the Surface Area of a Rectangular Prism = 1/4r^4
ok.