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Although metric, based on the A4 paper size, and named to suggest that it is part of the official ISO 216 paper sizes, it is only a de facto standard. It is often referred to as (metric) "foolscap" or "folio" because of its similarity to the traditional foolscap folio size of 8 + 1 ⁄ 2 in × 13 + 1 ⁄ 2 in (216 mm × 343 mm).
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 ...
Traditionally, a number of different sizes were defined for large sheets of paper, and paper sizes were defined by the sheet name and the number of times it had been folded. Thus a full sheet of "royal" paper was 25 × 20 inches, and "royal octavo" was this size folded three times, so as to make eight sheets, and was thus 10 × 6 + 1 ⁄ 4 inches.
Comparison of some near-A4 paper sizes: Image title: Comparison of A4, C4, PA4, Legal, Letter/ANSI A, Government letter, Foolscap folio and Arch A paper, as well as 8R/6P and S8R/6PW photographic paper sizes by CMG Lee. In the SVG file, hover over an outline or its label to highlight it. Width: 100%: Height: 100%
The term "folio" as applied to such books may refer simply to the size, i.e., books that are approximately 15 inches (38 cm) tall. At present, the term folio in the context of paper size is commonly used to refer to foolscap folio, which is print paper sized 8.5×13.5 in (216×343 mm), slightly larger (by 18.7%) than A4 paper.
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[citation needed] A4 ("metric") paper is easier to obtain in the US than US letter can be had elsewhere. [citation needed]. The ISO 216:2007 is the current international standard for paper sizes, including writing papers and some types of printing papers. This standard describes the paper sizes under what the ISO calls the A, B, and C series ...
For example, a quarto (from Latin quartÅ, ablative form of quartus, fourth [3]) historically was a book printed on sheets of paper folded in half twice, with the first fold at right angles to the second, to produce 4 leaves (or 8 pages), each leaf one fourth the size of the original sheet printed – note that a leaf refers to the single piece ...