You made an error in this video :( You said c squared was 28 squared when it should have been 24 squared :)

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well you should contact them and report the problem

I can see where you would think there is an error in the video. Since he is trying to find angle "A", but the variables in the law of cosines formula are set up to solve for "C." However, he substituted angle A for "C" which means that the side opposite angle "A" is in fact 28. He explains it around 0:45 in the video. Make sense?