radians are in pi format
360 degrees=2pi radians
x/360=y/2pi
x/180=y/pi
if we wanted to convert from radians to degrees then
if we had x radians then [tex]\frac{180x}{\pi}[/tex]=degrees
so pi/9 radians is [tex]\frac{180(\frac{\pi}{9})}{\pi}=\frac{20\pi}{\pi}=20^o[/tex]
20 degrees is pi/9 radians
the other one is easy as well
-5pi/12
[tex]\frac{180(\frac{-5\pi}{12})}{\pi}=\frac{75\pi}{\pi}=-75^o[/tex]
-75 degrees or 360-75=285 degrees
