为什么A2纸、A3纸、A4纸…的比例都是√2：1而不是其他比例? - 知乎
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早在1786年，一位德国的科学家Georg Christoph Lichtenberg就发现长宽比为的矩形具有许多特点。在20世纪初期Walter Porstmann将此概念应用在一系列纸张尺寸的制定，并且在1922年被制定为德国标准（DIN 476）。随着各国逐渐采用，后来此标准被定为国际标准（ISO 216）。
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