# How to Use the Math.atan() Method in JavaScript

09/30/2021

Contents

In this article, you will learn how to use the Math.atan() method in JavaScript.

## Using the Math.atan() method in JavaScript

The Math.atan() method is a built-in function in JavaScript that returns the arctangent (in radians) of a given number. The input parameter can be any number, positive or negative.

### Syntax

The syntax for using the Math.atan() method is:

``Math.atan(x)``

where x is the input parameter that represents the tangent of an angle.

### Examples

#### Using Math.atan() to calculate the arctangent of a number

``````const x = 0.5;
const arctangent = Math.atan(x);
console.log(arctangent); // 0.4636476090008061
``````

In this example, the input parameter is 0.5, which represents the tangent of an angle. The output is the arctangent of 0.5 in radians, which is approximately 0.4636.

#### Using Math.atan() with a negative value

``````const x = -0.7;
const arctangent = Math.atan(x);
console.log(arctangent); // -0.6107259643892086
``````

In this example, the input parameter is -0.7, which represents the tangent of an angle. The output is the arctangent of -0.7 in radians, which is approximately -0.6107.

Note: The output of the Math.atan() method is always in radians. If you want to convert the result to degrees, you can use the following formula:

``degrees = radians * (180 / Math.PI)``

where radians is the output of the Math.atan() method.