# What is Math.acosh() method in JavaScript?

`Math.acosh()`

is a JavaScript method that calculates the inverse hyperbolic cosine of a number. It was added to the Math object in ECMAScript 5.

The `Math.acosh()`

method takes a single number argument and returns the inverse hyperbolic cosine of that number. It can be used to calculate the angle in radians that is the arccosine of a number.

The `Math.acosh()`

method can be used to calculate the following expression:

The following code sample calculates the angle in radians that is the arccosine of a number using the `Math.acosh()`

method:

```
var num = 2.14;
var angleInRadians = Math.acosh(num);
console.log(angleInRadians);
```

The returned value is `1.5707963267948966`

.