Assuming they are joined full face to full face, the surface area is between 16 and 18 times the area of one face.
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Find the area to one side of one of the cubes and multiply it by 18
the surface area = 22 sq. inches
10cm2
If many smaller cubes are combined to form a larger cube, then the surface area of the large cube is: 6 x (length of one side squared)
Surface area of a sphere = 4πr2