It is: 886 = 384 square mm
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The surface area of a cube can be calculated by finding the area of each of the cube's six square faces and adding them together. Since all sides of a cube are equal, the area of one face is the side length squared. Therefore, the surface area of a cube with a side length of 8mm is 6 times 8mm squared, which equals 384 square millimeters.
6 faces, each of 8mm*8mm = 6*64mm2 = 384 mm2
you start by dividing the total area by the number of sides which there are 8 (octo-) 64mm / 8 sides = 8mm per side of the octohedren.
64 mm squared. (8mm multiplied by 8mm)
512 mm3