a^{2 } = b^{2}+c^{2}-2bc cos A

= 6^{2}+9^{2}-2*6*9*cos 42

= 36+81- 2*6*9*0.743145

= 36+ 81-80.2596= 36.74035

a = 6.06138

cos C = (a^{2}+b^{2}-c^{2})/(2ab) =36.74035+81-36/(2*9*6.06138) =0.749191

C = 41.5

B = 180-83.5 = 96.5

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