C# .Atan()

Math.Atan() is a static method that calculates the inverse tangent of a given number, in radians.

Syntax

Math.Atan(x);

• The Math.Atan() method takes one double as an argument and returns a double.
• Using this method requires the System namespace.

Example

This example first uses the Math.Atan() method to compute the arctangent of an angle in radians and then converts it to degrees:

using System;

class sample
{
  public static void Main()
  {
    double value = 1.0; // The tangent of an angle
    double angleInRadians = Math.Atan(value);
    Console.WriteLine("The arctangent of the angle in radians: {0}",angleInRadians);
    double angleInDegrees = angleInRadians * (180 / Math.PI);
    Console.WriteLine("The arctangent of the angle in degrees: {0}",angleInDegrees);
  }
}

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The above code creates the following output:

The arctangent of the angle in radians: 0.7853981633974483
The arctangent of the angle in degrees: 45

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Codebyte Example

The following example uses Math.Atan() to return the arctangent of a right angled triangle, where the side opposite the angle is equal to 7, and the side adjacent is 5:

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