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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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What is the surface of a box that is 3ft by 4ft by 5ft?

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need to measure the length and width of the front surface, then multiply these two measurements together. This will give you the area of the front surface of the box.


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To calculate the area of the front surface of a box, you would multiply the width of the box by the height of the box. This calculation gives you the area of the rectangular front surface.


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