Circumference Calculator

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

<!– Paste this code into an external JavaScript file named: calc.js  –>

/* This script and many more are available free online at
The JavaScript Source :: http://javascriptsource.com
Created by: Lee Underwood :: http://javascriptsource.com/ */

function circum() {
  var radius = prompt(“Enter the radius of the circle”,””);
  var circle = 2 * Math.PI * radius;
  alert(“The circumference is “+circle+”.”)
}

<!– Paste this code into the HEAD section of your HTML document.
     You may need to change the path of the file.  –>

<script type=”text/javascript” src=”calc.js”></script>

<!– Paste this code into the BODY section of your HTML document  –>

<form>
<input type=button value=”Calculate the circumference” onClick=”circum()”>
</form>
<p><div align=”center”>
<font face=”arial, helvetica” size”-2″>Free JavaScripts provided<br>
by <a href=”https://javascriptsource.com”>The JavaScript Source</a></font>
</div><p>