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2 x (3 x 3) + 4 x (3 x 4) = 2 x (9) + 4 x (12) = 18 + 48 = 66 square feet

==> IF the box is sealed, i.e. the top is closed, so there are six sides to it.

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Q: What is the surface area of a 3Ft by 3Ft by 4Ft box?
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