C# Math Atan2

Description

Math Atan2 returns the angle whose tangent is the quotient of two specified numbers.

Syntax

Math.Atan2 has the following syntax.


public static double Atan2(
  double y,
  double x
)

Parameters

Math.Atan2 has the following parameters.

y - The y coordinate of a point.
x - The x coordinate of a point.

Returns

Math.Atan2 method returns

Example

The following code shows how to use Math.Atan2 method.


using System;// ww w . j a v  a2  s.  co  m
class Sample 
{
    public static void Main() 
    {
        double x = 1.0;
        double y = 2.0;
        double angle;
        double radians;
        double result;
    
    // Calculate the tangent of 30 degrees.
        angle = 30;
        radians = angle * (Math.PI/180);
        result = Math.Tan(radians);
        Console.WriteLine("The tangent of 30 degrees is {0}.", result);
    
    // Calculate the arctangent of the previous tangent.
        radians = Math.Atan(result);
        angle = radians * (180/Math.PI);
        Console.WriteLine("The previous tangent is equivalent to {0} degrees.", angle);


    }
}

The code above generates the following result.