Find all missing information in the following triangle (trig)

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Mathematics

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Explanation & Answer

a2   = b2+c2-2bc cos A

  = 62+92-2*6*9*cos 42

  = 36+81- 2*6*9*0.743145

= 36+ 81-80.2596= 36.74035

a  = 6.06138

cos C = (a2+b2-c2)/(2ab) =36.74035+81-36/(2*9*6.06138) =0.749191

C = 41.5

B = 180-83.5 = 96.5



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