Circle Graphs / Pie Charts / Pie Graphs

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:

1. Determine what percent of the data is from each category.
2. Determine what percent of 360 degrees represents each category.
3. Divide up the circle.

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How To Make A Pie Graph Using A Protractor And Compass?

This video shows how to construct a circle graph from the given data.

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How To Construct A Circle Graph Given The Percentage Of Each Sector?

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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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