SOLUTION: in triangle ABC, a=2, b=3, and c=4. What is the value of cosC?

Algebra ->  Trigonometry-basics -> SOLUTION: in triangle ABC, a=2, b=3, and c=4. What is the value of cosC?      Log On


   

Question 717696: in triangle ABC, a=2, b=3, and c=4. What is the value of cosC?
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
in triangle ABC, a=2, b=3, and c=4. What is the value of cosC?
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Use Law of Cosines:
cos(C) = [2^2+3^2-4^2]/(2*2*3)
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cos(C) = -3/12 = -1/4
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Cheers,
Stan H.