What is the total surface area of a cuboid ?

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2 (lb + bh + hl)

(l \times b \times h)

(l \times b)

None of these

answer is A.

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Detailed Solution

We have to find what is the total surface area of a cuboid.
Question Image

Let the cuboid's length, width, and height be l, b and h, respectively.
The sum of the surfaces of a cuboid's six rectangular sides makes up its total surface area (TSA).
Therefore, TSA of cuboid

= l \times b + b \times h + h \times l + l \times b + b \times h + h \times l

= 2 (lb + bh + hl)

Thus the total surface area of a cuboid is

2 (lb + bh + hl)

.
Hence, option 1 is correct.

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