How much cardboard is needed to make a ractangular box of length 145mm width 70mm height 70mm?
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length = l = 145mm
breadth = b = 70mm
height = h = 70mm
amount of cardboard needed = TSA of the box
= 2 [lb + bh + hl]
= 2[145×70 + 70×70 + 70×145] = 2[10150+4900+10150]
= 2 × 25200 = 50400
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