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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