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      Question

      length, breadth and height of a cuboid are in the ratio

      of 6 : 4 : 3. if the total surface area of the cuboid is 972 cm², what is the length (in cm) of the diagonal of the cuboid?
      A 5√65 Correct Answer Incorrect Answer
      B 3√61 Correct Answer Incorrect Answer
      C 3√65 Correct Answer Incorrect Answer
      D 5√61 Correct Answer Incorrect Answer

      Solution

      Let the dimensions be 6x, 4x, and 3x. The formula for the total surface area (TSA) of a cuboid is: TSA = 2(lb+bh+hl) Substituting the dimensions: TSA = 2((6x×4x) + (4x×3x) +(3x×6x)) =2(24x² + 12x² + 18x2) = 2(54x2) = 108x2 Given the TSA is 972 cm²: 108x2= 972 x² = 972/108 x2 = 9 x=3 now the dimensions of the cuboid- length =6x=6×3=18cm breadth =4x =4×3=12cm height =3x=3×3=9cm The length of the diagonal d of a cuboid is given by- d2 =1²+b²+ h² Substituting the values: d2=182+122 +92 d2=324+ 144 +81 d = √549 d=3√61  

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