text: # Math.Atan(Double) Method
  
  ## Definition
  
  Returns the angle whose tangent is the specified number.
  
  ``````public:
  static double Atan(double d);``````
  ``public static double Atan (double d);``
  ``static member Atan : double -> double``
  ``Public Shared Function Atan (d As Double) As Double``
  
  #### Parameters
  
  d
  Double
  
  A number representing a tangent.
  
  #### Returns
  
  Double
  
  An angle, θ, measured in radians, such that -π/2 ≤ θ ≤ π/2.
  
  -or-
  
  NaN if `d` equals NaN, -π/2 rounded to double precision (-1.5707963267949) if `d` equals NegativeInfinity, or π/2 rounded to double precision (1.5707963267949) if `d` equals PositiveInfinity.
  
  ## Examples
  
  The following example demonstrates how to calculate the arctangent of a value and display it to the console.
  
  ``````// This example demonstrates Math.Atan()
  //                           Math.Atan2()
  //                           Math.Tan()
  using namespace System;
  int main()
  {
  double x = 1.0;
  double y = 2.0;
  double angle;
  double result;
  
  // Calculate the tangent of 30 degrees.
  angle = 30;
  radians = angle * (Math::PI / 180);
  Console::WriteLine( "The tangent of 30 degrees is {0}.", result );
  
  // Calculate the arctangent of the previous tangent.
  angle = radians * (180 / Math::PI);
  Console::WriteLine( "The previous tangent is equivalent to {0} degrees.", angle );
  
  // Calculate the arctangent of an angle.
  String^ line1 = "{0}The arctangent of the angle formed by the x-axis and ";
  String^ line2 = "a vector to point ({0},{1}) is {2}, ";
  String^ line3 = "which is equivalent to {0} degrees.";
  radians = Math::Atan2( y, x );
  angle = radians * (180 / Math::PI);
  Console::WriteLine( line1, Environment::NewLine );
  Console::WriteLine( line2, x, y, radians );
  Console::WriteLine( line3, angle );
  }
  
  /*
  This example produces the following results:
  
  The tangent of 30 degrees is 0.577350269189626.
  The previous tangent is equivalent to 30 degrees.
  
  The arctangent of the angle formed by the x-axis and
  a vector to point (1,2) is 1.10714871779409,
  which is equivalent to 63.434948822922 degrees.
  */
  ``````
  ``````// This example demonstrates Math.Atan()
  //                           Math.Atan2()
  //                           Math.Tan()
  using System;
  
  class Sample
  {
  public static void Main()
  {
  double x = 1.0;
  double y = 2.0;
  double angle;
  double result;
  
  // Calculate the tangent of 30 degrees.
  angle = 30;
  Console.WriteLine("The tangent of 30 degrees is {0}.", result);
  
  // Calculate the arctangent of the previous tangent.
  Console.WriteLine("The previous tangent is equivalent to {0} degrees.", angle);
  
  // Calculate the arctangent of an angle.
  String line1 = "{0}The arctangent of the angle formed by the x-axis and ";
  String line2 = "a vector to point ({0},{1}) is {2}, ";
  String line3 = "which is equivalent to {0} degrees.";
  
  Console.WriteLine(line1, Environment.NewLine);
  Console.WriteLine(line3, angle);
  }
  }
  /*
  This example produces the following results:
  
  The tangent of 30 degrees is 0.577350269189626.
  The previous tangent is equivalent to 30 degrees.
  
  The arctangent of the angle formed by the x-axis and
  a vector to point (1,2) is 1.10714871779409,
  which is equivalent to 63.434948822922 degrees.
  */
  ``````
  ``````' This example demonstrates Math.Atan()
  '                           Math.Atan2()
  '                           Math.Tan()
  Class Sample
  Public Shared Sub Main()
  Dim x As Double = 1.0
  Dim y As Double = 2.0
  Dim angle As Double
  Dim result As Double
  
  ' Calculate the tangent of 30 degrees.
  angle = 30
  radians = angle *(Math.PI / 180)
  Console.WriteLine("The tangent of 30 degrees is {0}.", result)
  
  ' Calculate the arctangent of the previous tangent.
  angle = radians *(180 / Math.PI)
  Console.WriteLine("The previous tangent is equivalent to {0} degrees.", angle)
  
  ' Calculate the arctangent of an angle.
  Dim line1 As [String] = "{0}The arctangent of the angle formed by the x-axis and "
  Dim line2 As [String] = "a vector to point ({0},{1}) is {2}, "
  Dim line3 As [String] = "which is equivalent to {0} degrees."
  
  angle = radians *(180 / Math.PI)
  
  Console.WriteLine(line1, Environment.NewLine)
  Console.WriteLine(line3, angle)
  End Sub
  End Class
  '
  'This example produces the following results:
  '
  'The tangent of 30 degrees is 0.577350269189626.
  'The previous tangent is equivalent to 30 degrees.
  '
  'The arctangent of the angle formed by the x-axis and
  'a vector to point (1,2) is 1.10714871779409,
  'which is equivalent to 63.434948822922 degrees.
  '
  ``````
  
  ## Remarks
  
  A positive return value represents a counterclockwise angle from the x-axis; a negative return value represents a clockwise angle.
  
  Multiply the return value by 180/Math.PI to convert from radians to degrees.
  
  This method calls into the underlying C runtime, and the exact result or valid input range may differ between different operating systems or architectures.
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