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The origins of the exact dimensions of Letter size paper are lost in tradition and not well documented. The American Forest and Paper Association argues that the dimension originates from the days of manual papermaking and that the 11-inch length of the page is about a quarter of "the average maximum stretch of an experienced vatman's arms."
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. So, an A1 page can fit two A2 pages inside the same area.
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Below is a list of currently available tablet PCs grouped by their width, depth, height, screen size, and appropriate tablet case sizes. The most popular presently available tablet computers are compared in the following table:
International standard envelope sizes Format Dimensions (mm) Dimensions (in) AR Suitable content format DL 110 × 220 4 + 1 ... B5 176 × 250 6 + 11 ⁄ 12 × 9 + 5 ...
The size and proportions of a book depend on the size of the original full sheet. If a sheet 480 by 640 mm (19 by 25 in) is used to print a quarto, the resulting untrimmed pages, will be approximately half as large in each dimension: width 240 mm ( 9 + 1 ⁄ 2 in) and height 320 mm ( 12 + 1 ⁄ 2 in).
A "thick" notebook (Russian: общая тетрадь, general-use notebook) with more than 24 sheets and up to 96 sheets, having width at least 144 mm and height no more than 297 mm (same height as A4 paper size). These notebooks are intended for usage in middle and high school for tasks like lesson notes, long-term projects, essays ...
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".