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Encyclopedia > A4 paper
A comparison of different paper sizes

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.

There have been many standard sizes of paper at different times and in different countries. ...

Results from FactBites:

 A4 paper size - Wikipedia, the free encyclopedia (171 words) A4 is a standard paper 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, Canada, Mexico, the Philippines, Chile and other American countries. An A3 sheet is double the area of an A4.
 Paper size - Wikipedia, the free encyclopedia (3053 words) 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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