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The 'A' series of paper is such that A0 is 1m2 in area and each next number up is half the previous area: A1 is 0.5m2, A2 is 0.25m2 and so on.

The ratio of the sides of the paper series are such that 1 Sheet of A0 can be cut in half parallel to its shorter side to create 2 sheets of A1; each sheet of A1 can be cut in half parallel to its shorter side to create 2 sheets of A2; and so on.

The sides are in the ratio of 1 : sqrt(2). A0 is approx 841mm x 1189mm, A1 is approx 595mm x 841mm, A2 is approx 420mm x 595mm, A3 is approx 297mm x 420mm, A4 is approx 210mm x 297mm, and so on.

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