SOLUTION: in triangle ABC, a = 7, b = 5, and c = 8. What is the value of cosC?

Algebra ->  Trigonometry-basics -> SOLUTION: in triangle ABC, a = 7, b = 5, and c = 8. What is the value of cosC?      Log On


   

Question 957420: in triangle ABC, a = 7, b = 5, and c = 8. What is the value of cosC?
Answer by Alan3354(69443) About Me  (Show Source):
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in triangle ABC, a = 7, b = 5, and c = 8. What is the value of cosC?
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Use the Cosine Law.
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c%5E2+=+a%5E2+%2B+b%5E2+-+2ab%2Acos%28C%29