The surface area of a box which is in the form of a cuboid whose dimensions are l × b × h is__________.
2(lb + bh + hl)
The surface area of a cuboid is nothing but the total surface area which is the area of 6 rectangular faces {(l,b), (b,h) , (l,h) , (l,b) , (b,h) , (l,h)} .
Total surface area = lb + bh + lh + lb + bh + lh = 2(lb + bh + hl).