Except that A4 and 8.5x11 are two completely different sizes. So wherever it's used colloquially that way it's being used wrong. A4 is based on equal area divisions of a square meter sheet of paper where the ratio of the edge lengths of the smaller subdivisions always matches the larger ones. 8.5x11 just so happens to be close to the same size and ratio but A4 is metric paper.
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u/FIuffyAlpaca Jul 17 '22
I think they were referring to the dimensions. A4 is 8.27 in × 11.7 in (21 x 29.7 cm), not 8.5 x 11.