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1. Why the A4 Card Became the Standard
May 08, 2010
ISO 216 is the international standard for paper sizes. It is based on the German DIN 476 standard for paper sizes. It should be noted that ISO paper sizes are all based on a single aspect ratio of square root of two. Successive sizes in the A series are defined by equally dividing into two in order to produce the next size. The sizes are A1, A2, A3, A4, A5. The size that is most frequently used is the A4 card. The A4 card measures 210 x 297 in millimeters. Then, as the numbers go up, the actual paper goes smaller. A5 pertains to the size half of an A4 card and A6 is half of A5... (read more)
Author: Michelle Anne Leah Custodio
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