83 deg = 83*pi/180 = 0.4611... * pi radians or 1.4486 radians.
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Pi radians is 180 degrees. So if you have theta in radians, multiply by 180/Pi
pi radians is 180 degrees.
The question is ambiguous and the two possible answers are: sin(pi)/3 = 0 and sin(pi/3) = sqrt(3)/2 It is assumed, of course, that since the angles are given in terms of pi, they are measured in radians and not degrees!
sin x = 0 at 0 degrees and 180 degrees and 360 degrees and all angles expressed in terms of n times pi in radians when n is any integer
83% = 83/100