Make a list of the items that you wish to illustrate on the circle graph. Beside each item list the percentage of that item.
Convert each percentage into degrees by multiplying it by 3.6, which is the number you arrive at when you divide 360 (degrees in a circle) by 100 (total amount in percentage).
Add the total of all items to make certain that the total is at least 360 degrees. If not, recalculate the degrees for each item.
Use your protractor to draw a circle to represent the whole. Make it large enough so those viewing your circle graph can read it easily.
Divide the circle into segments using the chart that you have just created. Mark the number of degrees by drawing a line from the center to the edge. Line this with the protractor as 0 degrees. Mark the number of degrees desired and draw a line from the center.
Continue through your numbers, using the previously made line as the 0 degree beginning and measuring out the necessary number of degrees for each category.
Label each section. For further enhancement of the chart, use color coded sections to show the difference.