Circle Graph | Instructions: | Suggested Lessons or Activities: | Special Features: | Other Related Modules and Useful Links:

Circle Graph

© R. Mirshahi


This resource is designed to take the students through the process of creating a circle graph by measuring the size of each arc in degrees and calculating the percentage of the whole circle.
size of arc in degrees divided by 360 degrees x 100 %.

circle graph percentage calculation .png
For example a 90 degrees arc is 25% or one-fourth of the whole circle. Let's say this is a survey of favourite sports and the green sector represents those who like hockey most. If 100 people were surveyed in total, 25 people would be those whose favourite sport is hockey. If the sample size is 20 people, 5 would be hockey lovers because 5 is one-fourth of 20.

The following are a list of common fractions and their percentage equivalents. Some values are rounded. It is beneficial to know these simple conversions.

1/2 = 50%
1/3 = 33%, 2/3 = 67%
1/4 = 25%, 2/4 = 50%, 3/4 = 75%
1/5 = 20%, 2/5 = 40%, 3/5 = 60%, 4/5 = 80%,
1/6 = 17%
1/7 = 14%
1/8 = 13%
1/9 = 11%
1/10 = 10%

The program generates data for you and it calculates the size of the arcs and draws them accordingly. You have the option of 2, 4, or 6 sectors to choose for your graph. Each time you click the button a different set of data and the corresponding circle graph are created for you.

Suggested Lessons or Activities:

  • Label each sector with the correct percentage. Drag the percentages and place them correctly on the circle graph.
  • hide the data (size of the arc in degrees and as percentage of the whole circle) and see if you can measure them using the protractor.
  • Type a title for the graph. For example, the graph could be about favourite sports. Label each sector on the chart with the sport that it could represent and write about the data. For example you can write which sport is the most or least popular. You can then print your work.

Special Features:

  • full screen (When typing you cannot be in full screen) but you can switch back and forth as you please).
  • ability to drag percentages to label sectors
  • protractor
  • ability to hide and show data
  • automatic, data generation each time giving you a different set of data and drawing the graph for you
  • option of 2, 4, or 6 sectors for your circle graph
  • pen tool for annotation
  • Print option

Other Related Modules and Useful Links: