What is the surface area of a rectangular prism with the following dimensions? length: 8 cm
width: 13 cm
height: 10.5 cm

$$Surface\ area: A_S=2(lw+lh+wh)\\\\l=8cm;\ w=13cm;\ h=10.5cm\\\\A_S=2(8\cdot13+8\cdot10.5+13\cdot10.5)=2\cdot(104+84+136.5)\\\\=2\cdot324.5=649\ (cm^2)$$

$$Surface \ Area \ of \ a \ Rectangular \ Prism \ : \\\\ SA = \ 2lw + 2lh + 2wh\\\\ l, \ w, \ and \ h \ are \ the \ lengths \ of \ the \ 3 \ sides\\ \\length:\ l= 8 \ cm \\width: \ w = 13 \ cm \\ height: \ h= 10.5 \ cm \\\\SA = \ 2\cdot 8 \cdot 13 + 2 \cdot 8 \cdot 10.5 + 2 \cdot 13 \cdot 10.5=208+168+273 = 649 \ cm^2$$

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