anonymous
  • anonymous
m
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
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anonymous
  • anonymous
I attempted to solve this triangle several times using Law of Cos.... But I get a Domain Error.
anonymous
  • anonymous
by cosine theorem, 31^2 =17^2 + 22^2 -2(17)(22) cos abc by calculation, we can get abc
anonymous
  • anonymous
I meant the seperate angles - m

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anonymous
  • anonymous
Also @CoCoTsoi Thats the same equation I set up, with cos B as my unknown. Thats where I ran into problems
anonymous
  • anonymous
I subtracted 17^2 + 22^2 from 31^2. That gave me -138915. Then I divided by -2(17)(22). I tried to take the inverse of this fraction, but my calculator informed of a domain error......
anonymous
  • anonymous
31^2 =17^2 + 22^2 -2(17)(22) cos abc cos abc = (31^2 -17^2 -22^2)/(-2)(17)(22) cosB = -0.25133 B=105 17/sin C = 31/sinB C=32 A=180-B-C=43
anonymous
  • anonymous
You are welcome

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