[tex]\displaystyle\\
a)~~\frac{\pi}{4}=\frac{180}{4}=45^o\\\\
b)~~\frac{7\pi}{6}=\frac{7\times180}{6}=7\times30=210^o\\\\
d)~~\frac{-3\pi}{2}=\frac{-3\times180}{2}=-3\times90=-270^o\\\\
e)~~\frac{7\pi}{12}=\frac{7\times180}{12}=7\times15=105^o\\\\
f)~~\frac{-9\pi}{5}=\frac{-9\times180}{5}=-9\times36=-324^o\\\\
g)~~\frac{100\pi}{3}=\frac{100\times180}{3}=100\times60=6000^o\\\\
h)~~\frac{-20\pi}{3}=\frac{-20\times180}{3}=-20\times60=-1200^o\\\\
i)~~\frac{245\pi}{9}=\frac{245\times180}{9}=245\times20=4900^o[/tex]
