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ISO paper sizes are all based on a single aspect ratio of the square root of 2, or approximately 1:1.41421. There are different series, as well as several extensions. The following international paper sizes are included in Cascading Style Sheets (CSS): A3, A4, A5, B4, B5. [2]
Successive paper sizes in the series (A1, A2, A3, etc.) are defined by halving the area of the preceding paper size and rounding down, so that the long side of A(n + 1) is the same length as the short side of An. Hence, each next size is nearly exactly half the area of the prior size.
[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 ...
The sizes of the RA series are also slightly larger than corresponding inch-based US sizes specified in ANSI/ASME Y14.1, e.g. RA4 is roughly equivalent to 8 + 1 ⁄ 2 in × 12 in (220 mm × 300 mm) and ANSI A (alias US Letter) is defined as 8 + 1 ⁄ 2 in × 11 in (220 mm × 280 mm).
A size chart illustrating the ANSI sizes. In 1992, the American National Standards Institute adopted ANSI/ASME Y14.1 Decimal Inch Drawing Sheet Size and Format, [1] which defined a regular series of paper sizes based upon the de facto standard 8 + 1 ⁄ 2 in × 11 in "letter" size to which it assigned the designation "ANSI A".
Index card (3 × 5 inches) [23] 60,000 mm 2: American letter paper (11 × 8.5 inches, "A" size) 62,370 mm 2: International A4 paper (210 × 297 mm) 92,903 mm 2: 1 square foot [24] 10 −1 125,000 mm 2: International A3 paper (297 × 420 mm) 180,000 mm 2: Surface area of a basketball (diameter 24 cm) [25] [26] 250,000 mm 2: International A2 ...