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The box has 6 sides. 2 each of 8 x 9, 8 x 12 and 9 x 12 ie 2 x (72 + 96 + 108) ie 2 x 276 which is 552 sq ins.

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Q: What is the surface area of a box a width 8 inches height of 9 inches and a length of 12 inches?
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