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let base length be a and height of the box be h

we have a^2 * h = 94

and we need to minimize suface area for using minimum material

so let A be surface area = a^2 + 4 a h

now replace h in terms of a using first equation. and differentiate then you will get a value for base length

the value of length = width =5.728654 =5.73 inch

and value of height =2.8643=2.86 inch

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