Most printing jobs are done on paper. Paper dimensions are defined by the ISO 216 standard, which specifies two main size series, series A and series B.
|Σειρά Α Σειρά Β|
|A0||841 x 1189||B0||1000 x 1414|
|A1||594 x 841||B1||707 x 1000|
|A2||420 x 590||B2||500 x 707|
|A3 zithromax antibiotico||297 x 420||B3||353 x 500|
|A4||210 x 297||B4||250 x 353|
|A5||148 x 210||B5||176 x 250|
|A6||105 x 148||B6||125 x 176|
|A7||74 x 105||B7||88 x 125|
|A8||52 x 74||B8||62 x 88|
|A9||37 x 52||B9||44 x 62|
|A10||26 x 37||B10||31 x 44|
This standard is based on the 1: √2 ratio. This ratio has the unique property that when cut or folded in half widthwise, the halves also have the same aspect ratio. Each ISO paper size is one half of the area of the next size up. The main advantage of this system is its scaling: if a sheet with an aspect ratio of is divided into two equal halves parallel to its shortest sides, then the halves will again have an aspect ratio of .
Folded brochures of any size can be made by using sheets of the next larger size, e.g. A4 sheets are folded to make A5 brochures.