How do you find the central angle of a pie chart for a section of the pie chart that represents 20% of the pie?

Each pie chart has 360°, since it is represented by a complete circle. If you are looking for 20% of that circle, you will use 20% of its 360 degrees as well.

##20/100 *360° = 72°##

Or: You can say: ##100% hArr 360^0## so every ##1% hArr3.6^0## and work from there.