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Triangle: Cosine Law

Input Data

Find: Triangle Pic
Side b:
Side c:
Angle A:
 


Result

a2 =  b2 + c2 - 2·b ·c·Cos A 

a2 =  102 + 202 - 2·10 ·20·Cos 30

a  =  ( 102 + 202 - 2·10 ·20·Cos 30 )0.5

a  =  12.393137     



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