Answer :

Length = l = 12 cm


Breadth = b = 9 cm


Height = h = 5 cm


Total surface area of cuboid = 2 × (lb + bh + lh)


= 2 × (12×9 + 9×5 + 12×5)


= 2 × (108 + 45 + 60)


= 2 × 213


= 426 cm2


Therefore, total surface area of the cuboid is 426 cm2


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