How to use law of cosines to find the missing angles of a triangle given SSS 

My teacher didn't feel the need to explain this and just gave us an example to copy down. Glad I found this. Thanks

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Idk why my teacher is making me do this “so called review homework” when I’m a sophomore in math 2?! I never even learned law of sines!!! Idk what a cos,tan, or sin is! Ugh 😫 Btw the corona virus closed down all schools so I really have no one to help me out on this:(

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Wish I could bring you back to my high school days. This was a great tut. I'm doing CAD and needed an angle on something. No protractor, but I wrote these steps out in C# and now I can just plug numbers in. Thanks! This was fun!

My teacher wasn’t teaching this properly, so I left the video call (I’ll be getting in trouble for that) now i’m given a test paper on sine and cosine rules. Thanks to this guy I’m clear on sine and cosine rules. Now we’ll see if my teacher gives me bad grading.

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Omg.. you have explained this so well.. it's so simple to solve.. and you helped me understand what the inverse thing is all about -I like the tip you used about finding the largest angle first.. it is the simplest and most accurate way to find all angles. I enjoy your teaching style. :)

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Hi sir! Thank you for such wonderful videos! I have found a much shorter way to find the angles if you know the sides! Is there any platform I could discuss it with you on? Please reply Thank you

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time: 5:33 - I get 76/-144= -.5429 but after that, no matter what i pump in I can not come up with an angle of 122.88 degrees. I used SIN COS TAN ASIN ACOS ATAN, with radiant and without, nothing close to your answer. You magically pumped this number into your calculator and got this answer. So this is where the whole thing fell apart for me.

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Where he did 76/-140, please leave it as a fraction rather than simplifying it. This leaves you with a more accurate number. Then you just put that fraction in when doing arccos(76/-140)

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