1 cubic foot. You gave a cube measuring 1 foot on each side. ■
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The volume of a cube with an edge of three feet is: 27 cubic feet.
The edge length of a cube with a diagonal of 9 ft is: 5.196 feet.
I guest that you mean that every edge of the prism is 10 ft, that is it is a cube of side 10 ft: A cube has 6 faces all the same size ⇒ surface_area = 6 x 10 ft x 10 ft = 600 sq ft.
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
122.91 sq. ft