Respostas

2014-01-15T06:28:40-02:00
240°  ~> x
180° ~  π rad

x ~> (240°/180) π rad ~> ( 4 / 3 )π rad

4 cm  . y = 12 cm .(4/3)π rad

y = (4 .4 / 4 )π rad ~> 4 π rad            letra   D)
5 4 5