mjambon, I just found out by accident that the A0 paper format is designed to have a surface area of 1 m²! An A4 sheet is obtained by cutting an A0 sheet in half 4 times, giving a surface area of 1/16 m².
It came up while playing with formulas to price artworks based on their dimensions. I was using sqrt(height * width) to obtain the side length of the equivalent square and I was surprised to get a round number for sqrt(21 * 29.7).
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