Metric paper sizes begin with with one of 3 basic sheets, named A, B and C, each of which has a particular purpose
In the case of the A sheet, A0 has an area of 1 square metre, and the sheet is then folded (halved along the longest side) to give A1. A1 can be folded in the same way, to give A2, and so on through A3, A4 etc. Read more
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