Sine and Cosine Rules

The Sine Rule

a / sin A = b / sin B = c / sin C

The Cosine Rule

a2 = b2 + c2 - 2 b c cos A

b2 = a2 + c2 - 2 a c cos B

c2 = a2 + b2 - 2 a b cos C

 

 
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