Calculators Effects >>> Circumference.


		<script 
		language="javascript"
		type="text/javascript">

		/* Visit http://www.yaldex.com/ 
		for full source code

		and get more free JavaScript, CSS and DHTML scripts! */

		<!-- Begin

		function 
		calculate()
		{

		var 
		radius=prompt("Please 
		enter the size of the radius","");

		var 
		pi=3.14159265359; 
		// estimated to 11 decimal 
		places

		var 
		circ=2*pi*radius;

		var 
		d=alert("The 
		circumference of a circle with radius "+radius+" 
		is "+circ+".")

		}

		// End -->

		</script>

		<form>

		<input 
		type=button
		value="Calculate 
		Circumference" 
		onClick="calculate()">

		</form>