• A circle graph is divided into sectors of a complete circle to represent categories and their values.
• A circle graph is sometimes called a pie graph or pie chart.
• The area, central angle and arc length is proportional to the size of the category represented.
• An exploded circle graph has one or more of the sectors separated from the rest of the circle. This is normally done to emphasize a particular category.
• Circle graphs are used to visually compare the size of different categories.

How to Create a Circle Graph

• Determine which values need to be shown in the circle chart.
• Create a data table with the categories in one column and the associated values in another column.
• Make a third column for the angle for each category.
• Determine the angle for each category by determining the proportion of the total circle that belongs to each category. The total of all the angles should equal 360^o
• Divide the circle into the appropriate sectors by drawing the appropriate angles.

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Circle Graph Example