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You imagine the cuboid, (which will have 6 faces) and work out the dimension of the edges for each individual face (there will be pairs of opposite faces with identical dimensions):

  1. 3 * 4 = 12
  2. 3 * 4 = 12
  3. 3 * 2 = 6
  4. 3 * 2 = 6
  5. 2 * 4 = 8
  6. 2 * 4 = 8

12 + 12 + 6 + 6 + 8 + 8 = 52

So the surface area is 52 square units.

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