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      Question

      Seven small cubes, each with a side length of 4 cm, are

      joined in a single row to form a cuboid. Find the total surface area of the cuboid.
      A 520 cm² Correct Answer Incorrect Answer
      B 200 cm² Correct Answer Incorrect Answer
      C 650 cm² Correct Answer Incorrect Answer
      D 480 cm² Correct Answer Incorrect Answer

      Solution

      ATQ,

      Length of cuboid = 7 × 4 = 28 cm

      Breadth of cuboid = 4 cm

      Height of cuboid = 4 cm

      Total surface area of cuboid = 2 × (lb + bh + hl)

      So, required area = 2 × (28 × 4 + 4 × 4 + 4 × 28) = 2 × (112 + 16 + 112) = 480 cm²

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