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      Question

      Three cubes of equal volume are joined end to end. Find

      the surface area of the resulting cuboid if the diagonal of the cube is 7√3cm.
      A 574cm² Correct Answer Incorrect Answer
      B 686cm² Correct Answer Incorrect Answer
      C 540cm² Correct Answer Incorrect Answer
      D 504cm² Correct Answer Incorrect Answer
      E none of these Correct Answer Incorrect Answer

      Solution

      Given – diagonal = a√3cm =7√3cm a = 7cm  Visible faces =14 Surface area of visible faces: - 14a² =14 ×49 =686cm²

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