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Part of a question I am working on asks me to "calculate the resistance of 1cm^3 of copper in the form of a thin sheet 0.5mm thick (between the faces of the sheet), given a resistivity of 1.69x10^-8 Ohm metres".

Given that p = RA/L, it is clear that R = pL/A = 1.69x10^-8 x L/A. So far, so good. But I am not sure that I can obtain L and A from merely a volume (1cm^3) and a thickness without making some assumption about its shape (a square sheet, perhaps)? Am I missing something?

Thanks!