Calculate Perimeter of Square

        
<!DOCTYPE html>
<html>
    <head>
        <title>perimeter of square</title>
    </head>
    <body>
        <h3>Calculate perimeter of square</h3>
        <form name="f1">
            Enter the side length:-<input type="number" name="n1"><br>
            <input type="submit" value="Calculate perimeter" onclick="peri()">
        </form>
        <script type="text/javascript">
            function peri()
                {
                    var s = f1.n1.value;
                    document.write("Perimeter of square of side length "+s+" is = "+2*s*s);
                }
        </script>
    </body>
</html>
Calculate perimeter of square

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