The first step is to find out the number of side.
If you draw a rough sketch, you will see that you are working with 360o in the center. Each angle is 30o. 360 / 30 = 12, so you have a 12 sided figure.
Each side is 5.7 inches
Perimeter = 5.7 * 12 = ____ which will be your answer in inches.
