# 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:

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

Output:

`1.4056476493802699`
• Example 2: When y-coordinate is smaller than x-coordinate

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

Output:

`0.16514867741462683`
• Supported Browsers: The browsers supported by JavaScript Math.atan2( ) function are listed below:

• Internet Explorer
• Firefox
• Opera
• Safari

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