The total surface area of a box which is in the form of a cuboid whose dimensions are $l \times b \times h$ is__________.

$2 (l b + b h + h l)$

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$(l b + b h + h l)$

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$2 (l h + b h)$

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$(l h + b h)$

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Solution

The correct option is A
$2 (l b + b h + h l)$

The total surface area of a cuboid is nothing but the sum of the area of six rectangular regions forming the cuboid.
$[(l \times b), (b \times h), (l \times h), (l \times b), (b \times h), (l \times h)]$

Total surface area
$= l b + b h + l h + l b + b h + l h$
$= 2 (l b + b h + h l)$

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