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Total Surface Area of a Cuboid

A rectangular...

Question

A rectangular box open at the top is to have a given capacity find the surface area of the box requiring card material.

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Solution

If dimension is $l, b$ and $h$
$\begin{matrix} V o l u m e = l \times b \times h c a r d r e q u i r e d = 2 b h + 2 l h + l b \end{matrix}$

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