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25-03-2017
Mathematics

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Law of cosines finding angle

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25-03-2017

The law of cosines is:

a^2=b^2+c^2-2bc*cosA where a,b,c are side lengths and A is the angle opposite the side on the other side of the equal sign...so

A=arccos(a^2-b^2-c^2)/(2bc)

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