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As a prefix meaning "inverse"[edit]

How did the English prefix arc- come to mean "inverse" with respect to trigonometric functions, such as arctangent? Is this a definition that's not currently included on the page? ~MDD4696 22:25, 15 November 2007 (UTC)


Yet there is certainly effort and artistry to it: Zoella has the paced, artfully slowed down delivery of a Just a Minute contestant, arcing each sentence to allow no hesitation, no repetition.[1] 00:25, 25 February 2017 (UTC)