Editing Paper size (section)

===Elongated sizes<span class="anchor" id="ISO 5457"></span>===

ISO 5457, last updated in 1999,<ref name="iso5457">{{Cite web|url=https://www.iso.org/standard/29017.html |title=ISO 5457:1999|website=ISO}}</ref> introduces elongated sizes that are formed by a combination of the dimensions of the short side of an A-size (e.g. A2) with the dimensions of the long side of another larger A-size (e.g. A0). The result is a new size, for example with the abbreviation A2.0 we would have a {{resx|420|1189}} mm size.

[[File:ISO 5457 elongated paper sizes.svg|alt=elongated ISO paper sizes|thumb|Elongated paper sizes schema]]
{| class="wikitable"
|+ ISO 5457 elongated paper sizes
! Size !! Short edge !! Long edge !! mm × mm !! in × in !!title="aspect ratio"| AR
|-
! A1.0
| A1/A2 || A0
| {{size|594|1189|ar=2:1}}
|-
! A2.0
|rowspan=2| A2/A3 || A0
| {{size|420|1189|ar=2√2:1}}
|-
! A2.1
| A1/A0
| {{size|420|841|ar=2:1}}
|-
! A3.0
|rowspan=3| A3/A4 || A0
| {{size|297|1189|ar=4:1}}
|-
! A3.1
| A1/A0
| {{size|297|841|ar=2√2:1}}
|-
! A3.2
| A2/A1
| {{size|297|594|ar=2:1}}
|}

These drawing paper sizes have been adopted by [[ANSI/ASME Y14.1|ANSI/ASME Y14.1M]] for use in the United States, alongside A0 through A4 and alongside inch-based sizes.