anonymous
  • anonymous
In ∆ABC, if the lengths of a, b, and c are 22.5 centimeters, 18 centimeters, and 13.6 centimeters, respectively, what are m B and m C to two decimal places? A.m B = 89.68°, and m C = 37.19° B.m B = 53.12°, and m C = 89.68° C.m B = 89.68°, and m C = 53.13° D.m B = 37.20°, and m C = 53.12° E.m B = 53.13°, and m C = 37.19° please help!
Mathematics
chestercat
  • chestercat
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Zale101
  • Zale101
Any ideas?
welshfella
  • welshfella
First use the Cosine Rule to find m angle C cos C = a^2 + b^2 - c^2 -------------- 2ab
welshfella
  • welshfella
Then use the Sine Rule to find m < B

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