Identify the pie’s diameter or radius
If you mean the mathematical constant pi, use 3.14159
If you mean a pie chart, find the total value first
Divide each category value by the total
Multiply the result by 100 to get a percentage
Convert each percentage to an angle by multiplying by 360
Draw the circle using a compass or trace a round object
Mark the slices with a protractor if needed
Label each slice clearly
Check that all slice angles add up to 360 degrees