I would assume the answer is 12, as a square has 2 diagonal lines, and a cube is really just six squares.
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A cube has:6 faces, each abutting 4 other faces4 vertical edges4 edges on each of the top and bottom faces.
64 sides = 64 angles From one angle you can draw (64 - 2) diagonals = 62. Lines from an angle to the immediately adjacent angles are sides, not diagonals.
33 triangles
24 diagonals
54