How do you use the Law of Cosines to find every side and angle in a non-right triangle when given two sides and the included angle?
Answer 1
Laura Steele
To find the third side of a non-right triangle when given two sides (a and b) and the included angle (C), use the Law of Cosines: c² = a² + b² – 2ab*cos(C). To find the remaining angles, use the Law of Sines or the Law of Cosines again: cos(A) = (b² + c² – a²) / (2bc) and cos(B) = (a² + c² – b²) / (2ac).
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