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resistivity question

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fiftythree
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question 1 b

https://pmt.physicsandmathstutor.com...t%201%20QP.pdf

mark scheme
https://pmt.physicsandmathstutor.com...t%201%20MS.pdf

Im confused with how they calculated the area as 4d^2
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Joinedup
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they are approximating the cross sectional area of each atom as the area of a square with side length d

the strip is 4 atoms wide and 1 atom thick


so it's 4x1xdxd or 4d2
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