Constructing Circle Graphs  
When data are expressed as parts of a whole, you can display the data in a circle graph. The entire circle represents 100% of the data. The different parts are represented as sectors of the circle. since there are 360º in a circle, the sum of the central angles formed by the sectors must be 360º Example: Draw a circle graph to represent the following data. In a survey, 350 people named their favorite movie: Star Wars, 119 Indiana Jones and the Temple of Doom, 98 Gone with the Wind, 77 White Christmas, 56
Step 1: Find the decimal for each part of the whole. The whole in this case is 350 (all the people surveyed) Star Wars: Gone with the Wind:
Indiana Jones: White Christmas:
Step 2: Find the measure of each films central angle (What part of the circle they should be drawn)
