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JavaScript Math atan2( ) Method

  • Last Updated : 23 Nov, 2020

Below is the example of the Math atan2() Method. 

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  • Example: When y-coordinate is greater than x-coordinate: 


<script type="text/javascript">
       document.write(Math.atan2(90, 15)); 



The Math.atan2() method is used to return the arctangent of the quotient of its arguments. The Math.atan2() method returns a numeric value between -Π and Π representing the angle theta of an (x, y) point and the positive x-axis. This is the counterclockwise angle, measured in radians, between the positive X-axis, and the point (x, y).


Math.atan2(value1, value2)

Parameters: This method accepts two parameters as mentioned above and described below:  

  • value1: This parameter represents the y-coordinate.
  • value2: represents x-coordinate of the point (x,y).

Returns: It returns the arctangent of the quotient of its arguments.

Below examples illustrate the Math.atan2() method in JavaScript:  

  • Example 1: 
Input : Math.atan2(90, 15);  
Output : 1.4056476493802699
  • Example 2: 
Input : Math.atan2(15, 90);
Output : 0.16514867741462683

More codes for the above method are as follows:

Program 1: When y-coordinate is smaller than x-coordinate  


<script type="text/javascript">
     document.write(Math.atan2(15, 90)); 



Program 2: When y-coordinate is same as x-coordinate 


<script type="text/javascript">
     document.write(Math.atan2(90, 90)); 



Supported Browsers: 

  • Google Chrome
  • Internet Explorer
  • Firefox
  • Opera
  • Safari


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