what is the surface area of a rectangular prism
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Surface area, SA=2(LW+LH+HW) where L=length, W=width, H=height (interchangeable).

Let L=12½=25/2, W=8⅓=25/3, H=10⅚=65/6.

Plugging in these values SA=11875/18=659.7222 square units approx.

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