https://betterexplained.com/articles/law-of-cosines/ Math lessons that click Tue, 18 Aug 2026 09:15:01 +0000 hourly 1 https://betterexplained.com/articles/law-of-cosines/#comment-568431 Tue, 18 Aug 2026 09:15:01 +0000 http://betterexplained.com/?p=4759#comment-568431 Two years after my first read, I come back to this article with fresh eyes. What strikes me is how something so simple can also be so profound.

]]> https://betterexplained.com/articles/law-of-cosines/#comment-568344 Fri, 26 Jul 2024 18:24:27 +0000 http://betterexplained.com/?p=4759#comment-568344 Thank you for this article, but the geometric proof is not intuitive at all, a lot of data is missing.

]]> https://betterexplained.com/articles/law-of-cosines/#comment-568129 Sat, 26 Jun 2021 22:45:18 +0000 http://betterexplained.com/?p=4759#comment-568129 That analogy of Alice and Bob helping or hurting each other and combining the individual interactions is genius…”multiplication shows what happens when the parts of a system interact”
Really helped in my understanding of the ideas behind calculus formulas. Never get rid of this site!

]]> https://betterexplained.com/articles/law-of-cosines/#comment-567614 Wed, 04 Sep 2019 19:55:08 +0000 http://betterexplained.com/?p=4759#comment-567614 @kalid Did you ever write more about the “idea that area is a generic, easily combinable quantity but individual paths are not”? I’d be interested in reading it if so. Your great post titled “Pythagorean Theorem As Sweeping Area” seems related, but I’d love to read more. And is this idea somehow related to why statistics uses squares in standard deviation and least-squares regression?

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