
Originally Posted by
Zyt3x
Thank you

I actually managed to do my homework with the use of your help
"a^2 + b^2 - 2 a b cos(fi) = c^2".
To be honest, this was not a part of my homework; the answer was to use proportions but I wanted to use a more advanced way.

The answer was to use proportions? You mean similarity or something?
Mind you some terminology used in American classes is a little different to the ones we use in Australia.
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