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JavaScript: Squareroot Function

sqrt Function :-
Returns the square root of a number.

Suntax :-

Description :-
If the value of number is negative,sqrt returns NaN. Because sqrt is a static method of Math,you always use it as Math.sqrt(), rather than as a method of a Math object you created.


<title>Calculate Squareroot</title>

<script language="javascript">
function calcsqrt()
var value=f1.sqrt.value;
alert("The Squareroot of " + value + " is " + Math.sqrt(value));


<form name="f1">
<input type="text" name="sqrt" value="Enter Number" size="20">
<input type="button" value="Calculate" onclick="calcsqrt()">



  1. i have to know that which formula they used in to the sqrt() method
    so if you know so please tell me

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