Law of cosine (visual proof) |mathocube|

In this video, we are going to find the Visual proof of law of cosine.
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[TimsDaBossMC]

1:20 does this mean that any two lines that intersect in a perfect circle will always be true y*y' = x*x' or did i miss something there? What is the name of this property?

[MdSajid-fdzf]

Sir, You always come with a new and better contents . It always helps me a lot . ☺️

[eipimath]

Thanks for sharing! I posted a short video on deriving the law of cosines, It should apply for all angles (acute, obtuse, reflex, negative). Hope to get your thoughts.

[ahappyimago]

How is (2acosO-b)b=(a-c)(a+c) when the lines are different lengths?

[RobSteel]

I've watched this video 3 or 4 times now pausing at points to grok the meaning. I would have sure liked a verbal or written walkthrough to go along with the video explaining each step. Also, it seems there would be links to other proofs used in this proof. For example, why can we assume that x.x' = y.y', link to or name of that proof please??

[calummascarenhas]

How did you know that the yellow triangle is a right-angled triangle?