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Question 58
The area of the sheet metal needed to make a box of size 7 cm $$\times$$ 8 cm $$\times$$ 9 cm is:
Solution
l = length = 7
b = breadth = 8
h = height = 9
The total surface area of the box = 2(lb+bh+lh)
=Â $$2\times(7\times8+8\times9+7\times9)$$
=Â $$2\times(56+72+63)$$
= $$2\times191$$
= 382Â $$cm^2$$
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