PIE CHART
Definition Of Pie Chart
A Pie Chart is a circular chart which is divided into sectors in which the area of each sector represents the size of the data.
More About Pie Chart
It is also known as circle graph.
Pie charts are used to show data in proportion.
When all the sectors are combined together it forms a complete disk.
Examples of Pie Chart
Video Examples: Drawing Pie Charts
The pie chart shown above represents the number of teachers for different subjects in a school.
The number at each pie slice indicates the number of teachers allotted for the particular subject.
As the pie chart shows, the number of teachers allotted for Mathematics is 24; the number of teachers allotted for Social Studies is 13; the number of teachers allotted for English is 15; the number of teachers allotted for Spanish is 10; and the number of teachers allotted for Science is 15.
Solved Example on Pie Chart
Ques: The pie chart shown below represents the percentage of dams built for different purposes. Find the total percentage of dams built for irrigation and hydroelectricity generation.
Choices:
A. 56%
B. 38%
C. 40%
D. 45%
Correct Answer: A
Solution:
Step 1: From the pie chart, the percentage of dams built for irrigation = 36
Step 2: Percentage of dams built for generating hydroelectricity = 20
Step 3: Percentage of dams built for irrigation and for generating hydroelectricity = 36 + 20 = 56 [Add the percentages.]
Step 4: So, 56% of the dams were built for irrigation and for generating hydroelectricity.
Quick Summary
- Shows data in proportion.
- Represents parts of a whole.
- Easy to understand visually.
🍎 Teacher Insights
Use real-world examples that are relevant to students' lives to make the concept more engaging. Hands-on activities can help solidify understanding.🎓 Prerequisites
- Basic arithmetic
- Fractions
- Percentages
Check Your Knowledge
Q1: In a pie chart representing favorite colors, if blue occupies 50% of the chart, what does this mean?
Q2: A pie chart shows the distribution of students in different grades. If there are 100 students total, and the 8th-grade slice is 25%, how many students are in 8th grade?
Frequently Asked Questions
Q: When should I use a pie chart?
A: Use a pie chart when you want to show the relationship of parts to a whole and you have a limited number of categories.
Q: What if my data doesn't add up to 100%?
A: Pie charts are best when the data represents a complete whole, totaling 100%. Consider other chart types if this isn't the case.