<html>
<head>
<title>Circle<title>
</head>
<body>
<script>
//Chao Li. Sep. 28, 2007
var radius = 0;
var diameter = 0;
var area = 0;
var perimeter = "";
alert ("We are going to find the radius of your circle.");
perimeter = prompt ("What is the perimeter of your circle?")
radius = perimeter / (2 * 3.141592658);
alert ("the radius is " + radius);
diameter = radius * 2;
alert ("the diameter is " + diameter);
area = 3.141592658 * (radius * radius);
alert ("and the area is " + area);
</script>
</body>
<html>
