A4 is a standardpaper size, defined by the international standard ISO 216 as 210×297 mm (roughly 8.27×11.69 in). It is the normal size of paper for both domestic and business purposes in all countries except the United States, Mexico, Canada and the Philippines. Image File history File links Download high resolution version (945x1299, 9 KB)ISO Paper Sizes - image uploaded to replace the original GIF File history Legend: (cur) = this is the current file, (del) = delete this old version, (rev) = revert to this old version. ... Image File history File links Download high resolution version (945x1299, 9 KB)ISO Paper Sizes - image uploaded to replace the original GIF File history Legend: (cur) = this is the current file, (del) = delete this old version, (rev) = revert to this old version. ... The word standard has several meanings: Classically, standard referred to a flag or banner; especially, a national or other ensign carried into battle; thus standard bearer indicates the one who bears, or carries, the standard. ... There have been many standard sizes of paper at different times and in different countries. ... ISO 216 specifies international standard (ISO) paper sizes, used in most countries in the world today. ... To help compare different areas this page lists areas between 0. ...
The aspect ratio of all international standard paper sizes is defined as the square root of two, before rounding, which ensures that if the paper is folded or cut in half parallel to its shorter side, the halves maintain the aspect ratio, and are the next standard size down (A4 becomes two sheets of A5): The aspect ratio of a two-dimensional shape is the ratio of its longest dimension to its shortest dimension. ... The square root of two is the positive real number which, when multiplied by itself, gives a product of two. ...
The area of an A4 sheet is 1/16 m2, as the area of an A0 is exactly 1m2.
The international paper size standard, ISO 216, is metric (the base format is a sheet of paper measuring 1 m²) and has been adopted by all countries in the world, except the United States and Canada.
ISO paper sizes are all based on a single aspect ratio of the square root of two, or approximately 1:1.4142.
Basing paper upon this ratio was conceived by the German scientist Georg Lichtenberg in 1786 (in a letter to Johann Beckmann), and in the beginning of the 20th century, Dr Walter Porstmann turned Lichtenberg's idea into a proper system of different paper sizes.
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