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ISO 217 : ウィキペディア英語版
ISO 217

The ISO 217:1995 standard defines the RA and SRA paper formats.
These paper series are untrimmed raw paper. RA stands for “raw format A” and SRA stands for “supplementary raw format A”. The RA and SRA formats are slightly larger than the corresponding A series formats. This allows bleed (ink to the edge) on printed material that will be later cut down to size. These paper sheets will after printing and binding be cut to match the A format.

* The ISO A0 format has an area of 1.00 m²
* The ISO RA0 format has an area of 1.05 m²
* The ISO SRA0 format has an area of 1.15 m²
== Tolerances ==
Paper in the RA and SRA series format is intended to have a 1:\sqrt aspect ratio but the dimensions of the start format have been rounded to whole centimetres.
For example, the RA0 format would be \sqrt
*2^ m \times \sqrt
*2^ m \approx 861.7 mm \times 1218.6 mm, which has been rounded to 860 mm \times 1220 mm.
The resulting real ratios are:
* 43:61 \approx 1:1.4186 for RA0, RA2, RA4;
* 61:86 \approx 1:1.4098 for RA1, RA3;
* 45:64 \approx 1:1.4222 for SRA0, SRA2, SRA4;
* 32:45 = 1:1.40625 for SRA1, SRA3.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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