The ISO 216 definition of the A paper sizes is based on the following basis: The A0 size has an area of 1 square metre. Each subsequent size A (n) is defined as A (n-1) cut in half parallel to its shorter sides. The standard length and width of each size is rounded to the nearest millimetre. A0 is the largest size, with an area of 1 square metre and a dimension ratio of 1 to √2. Each subsequent size is obtained by halving the preceding size across the larger dimension, e.g. A1 is half of A0, A2 is half of A1, and so on. A4 is the most common size for office documents, A5 for notepads, and A6 for postcards.
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