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# Trig help needed, there's a picture

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What are $$\cos (\angle A), \cos (\angle B), \cos (\angle C)$$in radians (or fractions)?

Jul 11, 2021

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It is NOT a right triangle, so you cannot us  S O H C A T O A

You will need to use the cosine law

c^2 = a^2 + b^2 - 2 a b cos c

8^2 = 5^2 + 7^2  - 2 ( 5 ) (7) cos A      solve for cos A          similar for the others

Jul 11, 2021