4 ms·
> ISO 216 defines the A series of paper sizes based on these simple principles: > - The height divided by the width of all formats is the square root of two (1
by app4soft 6y ago
> ISO 216 defines the A series of paper sizes based on these simple principles:
> - The height divided by the width of all formats is the square root of two (1.4142).
> - Format A0 has an area of one square meter.
When we look on A0 papers on the market mostly it's size is 841 mm × 1189 mm, that is not correspond to this standard:
- Length Ratio: 1189/841 = 1.41379310345 (should be 1.4142)
- Area: 0.999949 m² (should be 1.0 m²)
P.S. There are few websites which are useful for retrieving various paper formats sizes.[0,1]
[0] https://www.papersize.org/a-paper-sizes.htm https://www.papersize.org/a-paper-sizes.htm
[1] https://papersizes.io/a/ https://papersizes.io/a/
- jeddy3 6y ago> The standardized height and width of the paper formats is a rounded number of millimeters. The "rules" was five simple points, you can't just ignore the ones that doesn't suit your argumentation.
- function_seven 6y ago> - Area: 0.999949 m² (should be 1.0 m²) And it is! I mean, if you're not going to use an electron microscope to measure it :) The real measurements should be 840.9mm x 1189.2mm, but I'll forgive them for the rounding.
- occamrazor 6y agoAll paper sizes are rounded to the mm and the rounding is always down, so that is is possible to get two A(n+1) sheet by cutting one An sheet.
- jwilk 6y agoIt would be 840, not 841, if rounded down. Wikipedia says you should add 0.2 mm before rounding down (which gives you the expected 841), but it doesn't explain where that number comes from.
- brmgb 6y agoThe answer to your question is in the comment you are replying to. > the rounding is always down, so that is is possible to get two A(n+1) sheet by cutting one An sheet.
- jwilk 6y agoHuh? I pointed out that the rounding is not always down, and I didn't ask any questions.
- jwilk 6y agoAccording to https://en.wikipedia.org/wiki/Talk:ISO_216#Formula_looks_broken%3F https://en.wikipedia.org/wiki/Talk:ISO_216#Formula_looks_bro... the number was addead "as a fudge factor to make the formulae fit the known millimetre measurements". Yay… :-/
- occamrazor 6y agoTo be pedantic: the A0 size is determined by rounding to the closest integer. All other size by rounding down.
- lopmotr 6y agoDon't forget significant figures like your science teacher taught you. 841 mm has only 3, and both answers are correct to 3 sig. figs. So it's correct. Another way to see it. What dimensions should it have for you to deem it correct?
- zonefuenf 6y agoThe standard defines the paper sizes rounded to the nearest mm, so a certain deviation from the sqrt(2) ratio is in the standard.