Untitled

<html>
<body>
<script type="text/javascript">
function calcGeometry(radius) {
  var circumference = Math.PI * 2*radius;
  console.log("The circumference is " + circumference);
  var area = Math.PI * radius*radius;
  console.log("The area is " + area);
}
</script>
<form name=form1>
        Enter the radius of circle:
       <input type="text" name="txtRadius" size=10>
       <br>
       <input type="button" value="Calculate" onClick='calcGeometry();'>
    </form>
</body>
</html>