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4 cm
assume 4" thick. 4"x48"x192"/(36"x36"x36") = 0.79 yards 36" in a yard
The question cannot be answered. A square metre is a measure of area not of volume. A block of lead, with an area of 1 square metre could be a few atoms thick or several metres thick. Their weights will differ considerably.
A 4 mil thickness is four thousandths (0.004) of an inch.
2 cm (3/4") or 3 cm (1-1/4").