https://en.wikipedia.org/wiki/Paper_size

Many paper size standards conventions have existed at different times and in different ... The most frequently used paper size is A4 measuring 210 by 297 millimetres (8.27 in × 11.7 in). .... series sheets of the same number; for instance, the area of a C4 sheet is the geometric mean of the areas of an A4 sheet and a B4 sheet.

http://www.businessdictionary.com/definition/A4-size-paper.html

Definition of A4 size paper: The standard size of typing paper adopted by the International Standards Organization. It measures 210 mm wide and 297 mm longl ...

https://uk.onlinelabels.com/articles/what-s-the-difference-between-a4-and-us-letter-paper-sheets.htm

A4 paper size sheets are part of the ISO 216 system that has been internationally adopted. The most frequently used size in the UK is the A4 format. This size is ...

https://www.pcmag.com/encyclopedia/term/37308/a4-paper

Definition of: A4 paper. A4 paper. The common letter-sized paper used in Europe ... A4 paper is slightly narrower and a little longer than "A" size 8.5 x 11" paper ...

https://www.papersizes.org/a-paper-sizes.htm

The dimensions of the A series paper sizes, as defined by the ISO 216 standard, are given in the table below the diagram in both millimetres and inches (cm ...

https://www.papersizes.org/

An explanation of the ISO 216 paper size format standard, including definition of A series paper sizes (A3, A4, A5 etc)

https://www.ezeep.com/why-the-difference-between-a4-and-letter-actually-matters/

There is rhyme to the reason most countries have accepted the ISO 216 series of paper sizes (A4 et al.) as a standard. Apparently first discovered by physics ...

https://papersizes.io/a/

The dimensions of the A series paper sizes are defined by the ISO 216 international paper size standard. The A series was adopted in Europe in the 19th ...

https://www.prepressure.com/library/paper-size/din-a4

A4 measures 210 × 297 millimeters or 8.27 × 11.69 inches. In PostScript, its dimensions are rounded off to 595 × 842 points. Folded twice, an A4 sheet fits in a ...

https://blog.doublehelix.csiro.au/why-is-a4-paper-the-size-that-it-is/

Oct 23, 2012 ... Take a sheet of A4 paper and measure its sides. A4 is 210 millimetres wide and 297 millimetres long. It's probably the most common size of ...