RADIAN                                                               pp 140


 Define:  1 degree = (Pi / 180) * radians.  (  .01745329252 radians)
          1 radian = (180 / Pi) * degrees.  (57.29577951289 degrees)

 Purpose: Radians are a means of measuring angles.  The computer does all
          of its calculations in radians.

 Notes:   Pi is a pre-defined Turbo constant of 3.1415926536.


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 Usage:
       VAR
          Tangent : Real              ;  { Result in radians }
          Angle   : Real              ;  { Angle in radians }
          Radians : Real              ;

       BEGIN
          Angle   := ArcTan (Tangent) ;  { Tangent is in radians }
          Radians := Sin (Angle)      ;  { Angle is in radians }
          Radians := Cos (Angle)      ;  { Angle is in radians }
       END.