124 LearnersLast updated on July 22nd, 2025
Pie Chart
To visually represent data we use different types of chart, such as pie chart, line chart, bar graph, A pie chart is a type of chart that is used to represent statistical data. It is divided into slices to illustrate numerical proportions. Pie charts are useful to visualize data distribution, but they are less effective for comparing datasets and precise values.
What is a Pie Chart?
A pie chart is a circular graph where each slice represents the category share of the total. The pie chart represents 100% of the data, with each slice’s size directly proportional to its percentage of the whole. Pie charts are used to represent and visualize data like market shares, survey results, and budget allocations.
As you can see in the above image, the pie chart represents the data of a particular dataset, with each slice divided into a proportional size of the w
Importance of Pie Chart for Students
Pie charts are essential for students as they visually simplify data distribution and proportions. They make complex information easier to compare and are useful in subjects like mathematics, statistics, economics, and science. Using color to identify each division helps students improve their interpretation skills and understanding of fractions and percentages.
Properties of Pie Chart
Pie charts have several properties. The main properties of the pie chart are:
- Circular Shape:
A pie chart is always a circular graph that represents the whole (100%), which is divided into sections or slices.
- Sections (Slices):
The circular graph is divided into slices or sections, where each slice or section represents a category’s proportion of the total.
- Proportional Representation:
The size of each section or slice is proportional to the value or percentage it represents in the whole data set.
- Angle Measurement:
Each slice or section is calculated using the formula:
Angle = Category Value / Total Value x 360°
Percentage Values:
Pie charts usually display percentages within or near slices to indicate the proportion of each category.
Tips and Tricks to Master Pie Chart
There are many ways that we use to master pie charts. Let’s learn some tips and tricks:
Understanding the Basics:
Students should remember that a pie chart represents 100% of a dataset, with each section or slice showing a category’s proportion. The total of all angles in a pie chart is 360°.
Calculating Angles for Slices:
Students must remember the formula that is used to determine each section's angle:
Angle = Category Value/Total Value x 360°
They must always check that the sum of all the section angles equals 360°.
Converting Data into Percentages:
Students must be able to convert the given data into percentages for a better visual representation. They must ensure that the total of all percentages adds up to 100%. The formula used to convert data into percentages is mentioned below:
Percentage = Category ValueTotal Value x 100
Common Mistakes and How to Avoid Them in Pie Chart
Students often make mistakes when calculating and solving problems relating to pie charts. Here are some common mistakes that students tend to make and how to avoid them:
Mistake 1
Using Too Many Slices
Students tend to use too many slices for the given data. To solve this, they can group smaller categories into an “other” section or use a bar chart for clarity.
Mistake 2
Miscalculating Angles or Percentages
Students should practice and be able to differentiate between the formulas that are used to calculate percentages and the angle of each section or slice.
The formula used to calculate the angle of each slice is:
Angle = Category Value/Total Value x 360°
The formula used to calculate the percentage of each slice is:
Percentage = Category Value/Total Value x 100.
Mistake 3
Not Labelling the Slices Properly
Students should represent the slices or sections of the pie chart and name them according to the data given. The best way to practice that would be to label them as soon as they mark the particular slice or section on the pie chart.
Mistake 4
Poor Use of Colors
Students must use contrasting colors, as it helps the readers to get a better understanding of the pie chart. They must avoid using dull colors, as it makes it hard to distinguish the slices or sections.
Mistake 5
Using 3D or Tilted Pie Charts
Students often make mistakes when using 3D pie charts, assuming they will make the visual representation of the data even more eye-catching. Students should use the basic 2D representations of pie charts to get an accurate visual representation of the data given.
Real-World Applications of Pie Chart
Pie charts help us to get a visual representation of the data. Let us learn how pie charts are used in different fields.
- Business and Marketing:
Companies use pie charts to show the impact of different brands or products on the whole market share. Businesses use pie charts to analyze product sales across regions or countries.
- Finance and Economics:
We use pie charts for budget distributions, revenue analysis, and tax revenue allocation.
- Education and Research:
We use pie charts for survey results, analyzing subject-wise marks or student performance, and representing student distribution by gender, courses, or departments.
Solved Examples of Pie Charts
Problem 1
A class of 30 students was asked about their favorite fruit. The responses were as follows: 12 students liked apples 8 students liked bananas 6 students liked oranges 4 students liked grapes Represent the given data as a pie chart.
Explanation
Step 1: Find the total number of students: 30
Step 2: Calculate the angles for each fruit:
Angle = Category ValueTotal Value x 360°
For Apple:
Angle for apples = 12/30 × 360° = 144°
For Bananas:
Angle for bananas = 8/30 × 360° = 96°
For Oranges:
Angle for oranges = 6/30 × 360° = 72°
For Grapes:
Angle for grapes = 4/30 × 360° = 48°
Step 3: Draw the pie chart.
Problem 2
A family spends money on the following categories every month: Rent: $1200 Groceries: $600 Utilities: $300 Entertainment: $200 Savings: $100 Represent the given data as a pie chart.
Explanation
Step 1: Calculate the total expenses:
1200 + 600 + 300 + 200 + 100 = 2400 dollars.
Step 2: Calculate the angle for each category
For rent:
Angle for rent = 1200/2400 × 360° = 180o
For groceries:
Angle for groceries = 600/2400 × 360° = 90o
For utilities:
Angle for utilities = 300/2400 × 360° = 45o
For entertainment:
Angle for entertainment = 200/2400 × 360° = 30o
For savings:
Angle for savings = 100/2400 × 360° = 15o
Step 3: Draw the pie chart
Problem 3
In a market survey, the following market share percentages were observed for different smartphone brands: Apple: 40% Samsung: 30% Huawei: 15% Xiaomi: 10% Other brands: 5% Represent the given data as a pie chart.
Explanation
Step 1: Calculate the total percentage:
40 + 30 + 15 + 10 + 5 = 100
Step 2: Since the total percentage is 100%, we can directly convert the percentage into the angle by multiplying by 3.6
For Apple:
Angle for apple = 40 × 3.6 = 144°
For Samsung:
Angle for Samsung = 30 × 3.6 = 108°
For Huawei:
Angle for Huawei = 15 ×3.6 = 54°
For Xiaomi:
Angle for Xiaomi = 10 ×3.6 = 36°
For other brands:
Angle for other brands = 5 × 3.6 = 18°
Step 3: Draw the pie chart
Problem 4
A survey was conducted among 360 students to find their favorite school subjects. The results were: Mathematics: 90 students Science: 60 students English: 75 students History: 45 students Art: 90 students Represent the given data as a pie chart.
Explanation
Step 1: Find the total number of students:
90 + 60 + 75 + 45 + 90 = 360
Step 2: Calculate the angle for each subject:
Mathematics: 90/360 x 360° = 90°
Science: 60/360 x 360° = 60°
English: 75/360 x 360° = 75°
History: 45/360 x 360° = 45°
Art: 90/360 x 360° = 90°
Step 3: Draw the pie chart
Problem 5
In a class of 30 students, they were asked what their favorite sports and the results were: Basketball: 10 Students Football: 15 students Cricket: 5 students Represent the following data as a pie chart.
Explanation
Step 1: Calculate the total number of students:
10 + 15 + 5 = 30
Step 2: Calculate the angles for each category
For basketball:
Angle for basketball: 10/30 x 360° = 120°
For Football:
Angle for football: 15/30 x 360° = 180°
For Cricket:
Angle for cricket: 5/30 x 360° = 60°
Step 3: Draw the pie chart.
FAQs on Pie Chart
1.What is a Pie Chart?
2.How do I label the pie chart?
3.Can I use 3D pie charts?
4.When should I avoid using pie charts?
5.What are the advantages of using a pie chart?
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Jaipreet Kour Wazir
About the Author
Jaipreet Kour Wazir is a data wizard with over 5 years of expertise in simplifying complex data concepts. From crunching numbers to crafting insightful visualizations, she turns raw data into compelling stories. Her journey from analytics to education ref
Fun Fact
: She compares datasets to puzzle games—the more you play with them, the clearer the picture becomes!
