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2. ISO 216 - Wikipedia

   en.wikipedia.org/wiki/ISO_216

   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.

3. Paper size - Wikipedia

   en.wikipedia.org/wiki/Paper_size

   The international paper size standard is ISO 216. It is based on the German DIN 476 standard for paper sizes. Each ISO paper size is one half of the area of the next larger size in the same series. 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 ...

4. Moving sofa problem - Wikipedia

   en.wikipedia.org/wiki/Moving_sofa_problem

   The area thus obtained is referred to as the sofa constant. The exact value of the sofa constant is an open problem. The leading solution, by Joseph L. Gerver, has a value of approximately 2.2195. In November 2024, Jineon Baek posted an arXiv preprint claiming that Gerver's value is optimal, which if true, would solve the moving sofa problem. [2]

5. Architectural drawing - Wikipedia

   en.wikipedia.org/wiki/Architectural_drawing

   Sizes are determined by a consistent paper size system, according to local usage. Normally the largest paper size used in modern architectural practice is ISO A0 (841 mm × 1,189 mm or 33.1 in × 46.8 in) or in the USA Arch E (762 mm × 1,067 mm or 30 in × 42 in) or Large E size (915 mm × 1,220 mm or 36 in × 48 in). [3]

6. Book size - Wikipedia

   en.wikipedia.org/wiki/Book_size

   For example, a quarto (from Latin quartō, 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 ...

7. Furniture - Wikipedia

   en.wikipedia.org/wiki/Furniture

   NEN 1812 Furniture standard from the Netherlands: NEN is the Dutch Institute for Standardization, and NEN 1812 sets standards for furniture in the Netherlands. GB 28007-2011 Children's furniture – General technical requirements for children's furniture: This Chinese standard specifies technical requirements for children's furniture designed ...