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Q.

Surface area of a cuboid =

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a

2(lb+bh+lh)  

b

2π r 2  

c

2(lbh)  

d

2(l+b)   

answer is A.

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Detailed Solution

A cuboid is a three-dimensional shape made up of six two-dimensional rectangular planes with varying lengths (l), widths (b), and heights (h).
The total of the areas of each of the six rectangular planes will make up the cuboid's surface area.
Therefore, the surface area of a cuboid will be, lb+bh+lh+lb+bh+lh=2lb+2bh+2lh   ⇒   2(lb+bh+lh)  
Therefore, the correct option is 1.
 
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Surface area of a cuboid =