Respostas

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  • Ambicioso
2013-12-07T22:37:45-02:00
Cos B  =  \frac{AB}{BC}

Cos B =  \frac{6}{12}

Cos B =  \frac{1}{2}

B = 60º 

Sen C =  \frac{AB}{BC}

Sen C =  \frac{1}{2}

c = 30°
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