Problem 64 of 7
Use Law of Cosines to find missing angle in a=5,b=6,c=7, find C.
Hints
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rearrange formula and use inverse cosine.
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Rearrange formula and use inverse cosine for SSS cases.
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Solution
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1. Choose the angle opposite the side named in the formula.
2. Rearrange Law of Cosines for cosine of that angle.
3. Apply inverse cosine and interpret angle size.
Use the worked steps, then substitute the final answer back into the original relationship to confirm it satisfies the prompt.
Using inverse sine for SSS without first finding an angle-side pair.