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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