Question 205
This is a great question. When you draw pie charts, you deal with numbers as percentages of the total. So, let's say some number is 10% of the total (0.1, or one tenth). What angle should it require in a pie chart? There are 360 degrees in the pie. The angle should be 0.1 times 360, or 36 degrees. This way, just as all numbers in a total add to 100% of the total, all angles in the pie chart will also add up to 360 degrees.