<p><img src="https://imgs.xkcd.com/comics/iso_paper_size_golden_spiral.png" alt="The ISO 216 standard ratio is cos(45°), but American letter paper is 8.5x11 because it uses radians, and 8.5/11 = pi/4."></p>
<blockquote>
<p>"<a href="https://xkcd.com/2322/">ISO Paper Size Golden Spiral</a>", by Randall Munroe, licensed under Creative Commons Attribution-NonCommercial 2.5 License</p>
</blockquote>
<h2 id="alt-text"><a aria-hidden="true" class="anchor-heading" href="#alt-text"><svg aria-hidden="true" viewBox="0 0 16 16"><use xlink:href="#svg-link"></use></svg></a>Alt Text</h2>
<p>The ISO 216 standard ratio is cos(45°), but American letter paper is 8.5x11 because it uses radians, and 8.5/11 = pi/4.</p>

xkcd

ISO Paper Size Golden Spiral


# XKCD

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