This is the JavaScript for a circumference calculator.
<!DOCTYPE html>
<html>
<head>
<title>
JavaScript circumference caculator
</title>
<script type="text/javascript">
</script>
</head>
<body>
<script type="text/javascript">
var r = prompt('Enter the radius.', "");
var r_dub = 2*r;
var answer = r_dub *Math.PI;
document.write(answer);
</script>
</body>
</html>
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