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Paper size standards established by the International Organization for Standardization (ISO). The sizes are based on the metric system with length and width measurements designated in millimeters. The standards have been arranged into three different groups of requirements:A-series: for general printingB-series: for postersC-series: for envelopes, postcards, and folders The A-series is the most commonly used with sizes ranging from A0, which is the largest, down to A8. The A-series sizes are all represented as a part of the area of one square meter with a length to width ratio of 1.414. The size A0 is equivalent to the area of one square meter with each smaller size being 50% of the size of the preceding one. A1 is 50% of the area of A0, A2 is 50% of A1, and so on. Another way to look at it is that when an A0 sheet is cut in half, two A1 sheets are produced, and when an A1 sheet is cut in half, two A2 sheets are produced, and so on.
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