JavaScript Math sqrt() method

The JavaScript math sqrt() method returns the square root of a number. If the provided number is negative, it returns NaN.

Syntax

The sqrt() method is represented by the following syntax:

Parameter

num - A number.

Return

The square root of the given number.

JavaScript Math sqrt() method example

Here, we will understand sqrt() method through various examples.

Example 1

Let's see an example to print square root of the given numbers.

<script>
document.writeln(Math.sqrt(16)+ "<br>");
document.writeln(Math.sqrt(12));
</script>

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Output:

4
3.4641016151377544

Example 2

Let's see some cases where sqrt() method returns NaN.

<script>
document.writeln(Math.sqrt()+ "<br>");
document.writeln(Math.sqrt(-9));
</script>

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Output:

NaN
NaN

Example 3

Here, you can test sqrt() method with your own test cases.

<script>
function display()
{
  var x=document.getElementById("num").value;
document.getElementById("result").innerHTML=Math.sqrt(x);
}
</script>
<form>
  Enter a number: <input type="text" id="num">
  <input type="button"  onclick="display()" value="submit">
  </form>
  <p><span id="result"></span></p>

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