The current sizes are based on traditional sizes such as Letter (8.5 in × 11 in) and Legal (8.5 in × 14 in). The North American system is used primarily in the USA and Canada. The most commonly used ISO paper size is A4. The system became widely used during World War II. This new standard was known as the DIN 476 standard. Walter Porstmann brought Lichtenberg’s ideas into being in Germany. This idea was originally proposed by the German scientist Georg Christoph Lichtenberg in 1786. It is based on an aspect ratio of the square root of two, like the side of a square and its diagonal. ![]() They are the international and North American systems.Īs the term implies, the international standard, also known as the ISO 216 standard, is used throughout the world. Though other paper size standards exist, there are two predominant systems in use today.
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