The answer should be:
(2*a*b)+(2*b*c)+(2*c*a)
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Let its dimensions be a, b and c:- Surface area of the cuboid: 2*(a*b)+2*(b*c)+2*(a*c) in square units
First you need to know the size
the total surface area of a cuboid is : 2(lw+wh+hl) where l is length, w is width, and h is height.
For a cuboid (a 3D rectangle) of width W, height H and depth D, the surface area is: (WH + WD + HD) x 2.
2(lb+bh) where l=length b=breadth h=height