JavaScript | Math.atan2( )

The Math.atan2() function in JavaScript 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).

Syntax:

Math.atan2(value1, value2)

Parameters: This function accepts two parameters value1 and value2. value1 represents the y-coordintae and value2 represents x-coordinate of the point (x,y).

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

Examples:

Input  : Math.atan2(90, 15);  
Output : 1.4056476493802699

Input  : Math.atan2(15, 90);
Output : 0.16514867741462683

Below programs illustrate the Math.atan2() function in JavaScript:

• Example 1: When y-coordinate is greater than x-coordinate:
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  <script type="text/javascript">    document.write(Math.atan2(90, 15));   </script>

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  Output:

  1.4056476493802699

• Example 2: When y-coordinate is smaller than x-coordinate
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  <script type="text/javascript">    document.write(Math.atan2(15, 90));   </script>

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  Output:

  0.16514867741462683

Supported Browsers: The browsers supported by JavaScript Math.atan2( ) function are listed below:

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



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Shubrodeep Banerjee
I am a technology enthusiast who has a keen interest in programming I am pursuing Engineering in Computer Science from GEU, Dehradun I like to unwind by watching movies and English sitcomsI have a keen interest in music

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