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i assume you mean that the length of one edge of the cube is 12 feet. if so:

there are 6 faces on a cube

each face is a square

the area of a square is it's side squared

so...

6(12x12) = SA

6(144)=SA

864=SA

864 ft squared is the surface area

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Q: What is the surface area of a cube that is 12 ft?
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