Answer :

pi/3 radians is 60 degrees
pi radians = 180 degrees 

So: 
1 degrees = pi / 180 radians 

Now we can convert any number of degrees into radians by multiplying it by pi/180 

So: 
60 degrees = 60 * pi / 180 = pi * 60 / 180 = pi * 1/3 = pi / 3 radians

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