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A3 paper is a larger format within the ISO 216 paper size standard, measuring 297 millimeters by 420 millimeters (11.7 inches by 16.5 inches). Its dimensions offer significantly more space compared to. The dimensions of size A3 are as follows: 297 x 420 mm or 29.7 x 42 cm. Compared to other formats, A3 is: double A4, four times A5, half A2 and a quarter of A1. Like the other most common formats, A3. A3 paper measures 297 x 420 mm (29.7 x 42.0 cm or 11.7 x 16.5 inches). It is a common size in the workplace and offers double the space of A4, making it useful for spreadsheets, tables, diagrams,.
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