Respostas

2014-02-19T11:00:56-03:00
1 \pi  rad ------180^0

 \frac{7 \pi }{6} rad----------------x


x =  \frac{7 \pi }{6} . 180^0 =  \pi .X

X= 210°

Seno de 210° = - seno 30°  =  - 0,5

2 2 2