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You have a box measuring (in inches) 9 (length) x 3 (width) x 2 (depth) = 54 cubic inches. But you want the surface area. One top, one bottom two sides, two ends.
Top and bottom are (9x3)x2 = 54 square inches.
Two long sides are (9x2)x2 = 36 square inches.
Two ends are (3x2)x2 = 12 square inches.
54 + 36 + 12 = 102 square inches.

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Q: What is the surface area of a 9x3x2?
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