a) 137°= [tex] \frac{137}{180} \pi = \frac{137 \pi }{180} [/tex]
b) 147°= [tex]\frac{147}{180} \pi = \frac{49}{60} \pi = \frac{49 \pi }{60} [/tex]
c) 133°=[tex]\frac{133}{180} \pi = \frac{133 \pi }{180}[/tex]
d) 143°=[tex]\frac{143}{180} \pi = \frac{143 \pi }{180}[/tex]
