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When the PDF.js project started `Math.hypot` didn't exist yet, and until recently we still supported browsers (IE 11) without a native `Math.hypot` implementation; please see this compatibility information: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/hypot#browser_compatibility Furthermore, somewhat recently there were performance improvements of `Math.hypot` in Firefox; see https://bugzilla.mozilla.org/show_bug.cgi?id=1648820 Finally, this patch also replaces a couple of multiplications with the exponentiation operator.