Illustrator has easy to use tools to make simple shapes into precise drawings including built-in math to divide shapes into concentric copies. The text entered in the Rotate dialog box was 360 / 12 and that translates to 360 degrees evenly divided into 12 separate shapes with a result of 30 degrees each. Press the copy button and your shapes is copied and moved 30 degrees. Press Cmd+D (Mac) Ctrl+D (Win) 11 times and you’ve copied full circle.
That’s just one of many cool things about Illustrator.
Or you can “cheat” and just download the chart here:
http://www.mediafire.com/view/es4uclqswuliuc3/Micro_Focus.pdf
Download your FREE 30 day trial of Adobe Creative Cloud
http://adobe.ly/1S3mZW3