Circle Graphs / Pie Charts / Pie Graphs
In these lessons, we will learn:
- how to construct circle graphs or pie charts.
- how to read or use circle graphs or pie charts.
Related Pages
Graphical Methods For Describing Data
Bar Charts
Statistics Lessons
Constructing Circle Graphs Or Pie Charts
A pie chart (also called a Pie Graph or Circle Graph) makes use of sectors in a circle. The angle of a sector is proportional to the frequency of the data.
The following diagram shows how to use the formula to determine the angle of each sector in a circle graph or pie chart.
Study the following steps of constructing a circle graph or pie chart:
Step 1: Calculate the angle of each sector, using the formula.
Step 2: Draw a circle using a pair of compasses.
Step 3: Use a protractor to draw the angle for each sector.
Step 4: Label the circle graph and all its sectors.
Example:
In a school, there are 750 students in Year1, 420 students in Year 2 and 630 students in Year 3.
Draw a circle graph to represent the numbers of students in these groups.
Solution:
Total number of students = 750 + 420 + 630 = 1,800.
Draw the circle, measure in each sector. Label each sector and the pie chart.
How To Construct A Circle Graph Or Pie Chart From A Table Of Percentages Or Fractions?
Steps to making a circle graph:
- Determine what percent of the data is from each category.
- Determine what percent of 360 degrees represents each category.
- Divide up the circle.
How To Make A Pie Graph Using A Protractor And Compass?
This video shows how to construct a circle graph from the given data.
How To Construct A Circle Graph Given The Percentage Of Each Sector?
How To Draw A Pie Chart?
This video shows how to draw a pie chart by working out angles from a table.
Example: The table shows 18 people’s favorite color. Display the information as a pie chart.
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