5 Millimeters equals 5.4 Square Feet?

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A gold nugget of 5 mm in diameter (bottom) can be expanded through hammering into a gold foil of about 0.5 square meters Toi museum, Japan CCbySA3.0

It’s not some new kind of math. A gold nugget of 5 mm in diameter (bottom speck) can be expanded through hammering into a sheet of gold foil about 0.5 square meters or 5.38 square feet. That’s Amazing! See Gold Leaf; Goldbeating