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      Question

      Eight identical cubes of edge 4 cm are joined end to end.

      Calculate the total surface area of the solid formed.
      A 400 cm² Correct Answer Incorrect Answer
      B 544 cm² Correct Answer Incorrect Answer
      C 650 cm² Correct Answer Incorrect Answer
      D 770 cm² Correct Answer Incorrect Answer

      Solution

      ATQ,

      Length = 8 × 4 = 32 cm

      Breadth = 4 cm

      Height = 4 cm

      Total surface area = 2 × (32 × 4 + 4 × 4 + 4 × 32)

      = 2 × (128 + 16 + 128) = 2 × 272 = 544 cm²

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