1. Warm Up Write each fraction as a percent. 1. 2. 3. 3 1 2
Write each percent as a fraction.
4. 20% % % 3 4 1 10 2 5

2. Learn to read and interpret data presented in circle graphs.

3. A circle graph, also called a pie chart, shows how a set of data is divided into parts.
The entire circle contains 100% of the data.
Each sector, or slice, of the circle represents one part of the entire data set.

4. The circle graph compares the number of species in each group of echinoderms. Echinoderms are marine animals that live on the ocean floor. The name echinoderm means “spiny-skinned.”

5. Additional Example 1A: Life Science Application
Use the circle graph to answer the question.
Which group of echinoderms includes the fewest number of species?

6. Additional Example 1B: Life Science Application
Use the circle graph to answer the question.
Approximately what percent of echinoderm species are brittle stars and basket stars?

7. Additional Example 1C: Life Science Application
Use the circle graph to answer the question.
Which group is made up of a greater number of species, sea cucumbers or sea stars?

8. Use the circle graph to answer each question.
Check It Out: Example 1A
Use the circle graph to answer each question.
Which size car sold the most?
Midsize
Small
Luxury
Large

9. Use the circle graph to answer each question.
Check It Out: Example 1B
Use the circle graph to answer each question.
Approximately what percent of cars sold were midsize?
Midsize
Small
Luxury
Large

10. Use the circle graph to answer each question.
Check It Out: Example 1C
Use the circle graph to answer each question.
Which size sold less—large or small?
Midsize
Small
Luxury
Large

11. Additional Example 2A: Interpreting Circle Graphs
Leon surveyed 30 people about pet ownership. The circle graph shows his results. Use the graph to answer each question.
How many people own dogs only?

12. Additional Example 2B: Interpreting Circle Graphs
Leon surveyed 30 people about whether they own pets. The circle graph shows his results. Use the graph to answer each question.
How many people own both cats and dogs?

13. Check It Out: Example 2A
Fifty students were asked which instrument they could play. The circle graph shows the responses. Use the graph to answer each question.
flute
10%
How many students do not play an instrument?
drum
20%
no instrument
50%
piano
20%

14. Check It Out: Example 2B
Fifty students were asked which instrument they could play. The circle graph shows the responses. Use the graph to answer each question.
flute
10%
drum
20%
Ten students said they play the piano. How many play the flute?
no instrument
50%
piano
20%

15. Additional Example 3A: Choosing an Appropriate Graph
Decide whether a bar graph or circle graph would best display the information. Explain your answer.
the percent of U.S. population living in the different states

16. Additional Example 3B: Choosing an Appropriate Graph
Decide whether a bar graph or circle graph would best display the information. Explain your answers.
the number of tickets sold for each night of a school play

17. Additional Example 3C: Choosing an Appropriate Graph
Course 2
7-4
Reading and Interpreting Circle Graphs
Additional Example 3C: Choosing an Appropriate Graph
Decide whether a bar graph or circle graph would best display the information. Explain your answers.
the comparison between the number of students in a math class and the total student population.

18. Check It Out: Example 3A
Decide whether a bar graph or circle graph would best display the information. Explain your answers.
the percent of people buying a certain color of a new vehicle

19. Check It Out: Example 3B
Decide whether a bar graph or circle graph would best display the information. Explain your answers.
the comparison of different themes voted on for a school party

20. Check It Out: Example 3C
Decide whether a bar graph or circle graph would best display the information. Explain your answers.
the number of visitors to the Grand Canyon for the last ten years

21. Use the circle graph to answer questions 1-4.
Lesson Quiz: Part I
Use the circle graph to answer questions 1-4.
1. Which group of CDs sold the most?
2. What percent of the CD sales are country?
3. Which type of CD sells the least?
41%
4. If a total of 500 CD’s are sold, how many are Jazz?