Returns the arc tangent (in radians) of a specified number. The arc tangent is the angle whose tangent is the specified number.
[Visual Basic] Public Shared Function Atan( _ ByVal d As Double _ ) As Double [C#] public static double Atan( double d ); [C++] public: static double Atan( double d ); [JScript] public static function Atan( d : double ) : double;
Returns an angle q, measured in radians, such that-/2 < q < /2.
A positive result represents a counterclockwise angle from the x-axis; a negative result represents a clockwise angle. To convert the result from radians to degrees, multiply it by 180/.