To find the Square Root value of a certain number, you can use the JavaScript `Math.sqrt()`

method. You need to pass the number into the method as follows:

```
Math.sqrt(9);
// returns 3
```

If you pass a negative number to the method, it will return `NaN`

instead of a number:

```
Math.sqrt(-9);
// returns NaN
```

The method only accepts one parameter. When you pass more than one parameter, the rest is ignored:

```
Math.sqrt(9, 18, 27);
// returns 3
```

## Square Root constants in JavaScript

The Math object also has two static square root properties that you can use in your code immediately. They are:

`Math.SQRT1_2`

which returns the Square Root value of 1/2`Math.SQRT2`

which returns the Square Root value of 2

Since both are static properties, you can use them just like a normal variable:

```
console.log(`The Square Root of 1/2 is ${Math.SQRT1_2}`);
console.log(`The Square Root of 2 is ${Math.SQRT2}`);
```

**More on JavaScript:**