What is the meaning of A4?!


Question:

What is the meaning of A4?

why the standard white paper use to called A4. who invented this name and when.

there is also A3, A0 size


Answers:

Paper in the A series format has a aspect ratio, although this is rounded to the nearest millimetre. A0 is defined so that it has an area of 1 m², prior to the above mentioned rounding. Successive paper sizes in the series (A1, A2, A3, etc.) are defined by halving the preceding paper size parallel to its shorter side, again prior to rounding.[citation needed] The most frequently used of this series is the size is A4 (210 × 297 mm). The formula that gives the larger border of the paper size An in metres and without rounding off is the geometric sequence: . The paper size An has thus the dimension an × an + 1.


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