Question

find the surface area of cubical box which is side is 1m assuming that the box has no lead(hint the box is a cube with only 5 surfaces)

Answer 1

the surface area of cubical box is given by the formula
$6 \times {(side)}^{2}$
since one of its surface is missing

therefore

6l^2-l^2 = 5l^2

thus
surface area of the box is

5× 1^2= 5

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