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Q.

What is the formula for the total surface area of a cuboid?


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a

2(lb+bh+hl)

b

(l×b×h)

c

(l×b)

d

None of these 

answer is A.

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Detailed Solution

Here, we have to find the formula for the total surface area of a cuboid.
Consider the cuboid:
Question ImageAssume the length, breadth and height of the cuboid be l, b and h respectively.
A cuboid's total surface area (TSA) is the sum of the areas of its six rectangular sides.
So, the TSA of cuboid =l×b+b×h+h×l+l×b+b×h+h×l ⇒TSA=2(lb+bh+hl) Therefore, the total surface area of a cuboid is 2(lb+bh+hl).
Hence option (1) is correct.
 
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