with argument no return value.html

<html>

<head>
	<script type="text/javascript">
		function chek_value() {
			var pi = 3.14;
			var rad = parseInt(prompt("Enter value of radius "));
			var area;
			area = pi * rad * rad;
			return area;
		}
	</script>
</head>

<body>
	<script type="text/javascript">
		var arr;
		arr = chek_value();
		document.write("area of circle is=" + arr);
	</script>
</body>

</html>