Answer:
Multiply the quotient of the number and the total by 360 degrees.
Explanation:
If there are three parts that you want to convert to a circle graph (say 12, 9 and 15)
Step 1: Add all the numbers together.
12+9+15 =36
Step 2: Multiply the quotient of each number and the total by 360 degrees.
These are:

This is how you convert a number for a part into its corresponding angle measure.