cascading style sheets or iso 216

Charting outliers on a world map looks suspiciously similar to countries that utilize the metric system versus countries who don’t, but it is worth reflecting on the mathematical properties that stand behind this universal format for paper size that makes each in the series, from poster to letter to brochure and so on, derivative and retains the same aspect ratio—the square root of two (≈ 1.4142857 rounding to the nearest millimetre) to one. When a sheet of paper with these dimensions is folded in half along the shorter axis (widthwise), each half retains the same ratio and is incredibly useful for scaling a job up or down without cutting a part out or leaving an empty margin.