International standard for paper sizes, including A4
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Visualization with paper sizes in formats A0 to A8, exhibited at the science museum CosmoCaixa BarcelonaAn A4 paper sheet folded into two A5 size pages
ISO 216 is an international standard for paper sizes, used around the world except in North America and parts of Latin America. The standard defines the "A", "B" and "C" series of paper sizes, which includes the A4, the most commonly available paper size worldwide. Two supplementary standards, ISO 217 and ISO 269, define related paper sizes; the ISO 269 "C" series is commonly listed alongside the A and B sizes.
All ISO 216, ISO 217 and ISO 269 paper sizes (except some envelopes) have the same aspect ratio, √2:1, within rounding to millimetres. This ratio has the unique property that when cut or folded in half widthways, the halves also have the same aspect ratio. Each ISO paper size is one half of the area of the next larger size in the same series.[1]
^"International Paper Sizes & Formats". Paper Sizes. Retrieved 29 June 2020.
ISO 217 and ISO 269, define related paper sizes; the ISO 269 "C" series is commonly listed alongside the A and B sizes. All ISO216, ISO 217 and ISO 269...
defines a C series for envelopes International standard paper sizes: ISO 216 details and rationale ISO216 at iso.org ISO 217 at iso.org ISO 269 at iso.org...
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matter −Trimmed sizes−A and B series to ISO216 JIS P 0138-61 (JIS P 0138:1998) - Process finished paper size (ISO216 with a slightly larger B series) Management...
respect to both capacity and paper size. Countries that use ISO paper sizes (as specified by ISO216), which is most countries, use a two- or four-hole system...
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describes the paper sizes under what the ISO calls the A, B, and C series formats. Not all countries follow ISO216. North America, for instance, uses certain...
paper sizes. Today, the (approximate) aspect ratio of paper sizes under ISO216 (A4, A0, etc.) is 1: 2 {\displaystyle {\sqrt {2}}} . Proof: Let S = {\displaystyle...
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