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Find out the circumference of a circle by entering its radius. Very simple!

Label: Circumference Calculator

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<script language="javascript">

// Created by: Lee Underwood :: http://javascript.internet.com/

function circum() {
  var radius = prompt("Enter the radius of the circle","");
  var circle = 2 * Math.PI * radius;
  alert("The circumference is "+circle+".")
}
</script>
	<!--
    	This script downloaded from www.JavaScriptBank.com
    	Come to view and download over 2000+ free javascript at www.JavaScriptBank.com
	-->

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<input type=button value="Calculate the circumference" onClick="circum()">
	<!--
    	This script downloaded from www.JavaScriptBank.com
    	Come to view and download over 2000+ free javascript at www.JavaScriptBank.com
	-->