mozda VAKO? xd

<html>
<head>
<title>Find the area and circumference of a circle</title>
</head>
<body>
  <script language="JavaScript">
    function CalculateArea(){
        var sol = document.getElementById("solution");

        var radius =document.form1.txtRadius.value;
        sol.innerHTML += "<P>The area of the circle is " + (radius * radius * Math.PI) + "</p>";
        sol.innerHTML+="<P>The circumference of the circle is " + (2 * radius * Math.PI) + "</p>";
    }
    </script>
    <form name=form1>
        Enter the radius of circle:
       <input type="text" name="txtRadius" size=10>
       <br>
       <input type="button" value="Calculate" onClick='CalculateArea();'>
    </form>
    <div id="solution"></div>
</script>
</body>
</html>