One side or edge times another. (length x width = area)
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The area of one face on the cube with side length 3.5 units is 12.25 units squared one face of a cube is a square, so the area of the face is the length of the face squared, in this case 3.5 X 3.5 which is equal to 12.25
Six times the area of one face...
The area of one face of a 3cm cube is the area of a 3cm square. That's 3 x 3 = 9cm2.
The total surface area of a cube would be 6 x area-of-one-cube-face (there are 6 faces to a cube). Each face of a cube is a square. If any edge of the cube is "a", then: 6 x a x a.
Area of one face - 64cm2 Volume of whole cube - 512cm3