1. 7-4 Reading and Interpreting Circle Graphs Warm Up Warm Up Lesson Presentation Lesson Presentation Problem of the Day Problem of the Day Lesson Quizzes Lesson Quizzes

2. 7-4 Reading and Interpreting Circle Graphs Warm Up Write each fraction as a percent. 1.2.3. Write each percent as a fraction. 4. 20%5. 25%6.60% 75% 10% 40% 3 4 1 10 2 5 1 5 1 4 3 5

3. 7-4 Reading and Interpreting Circle Graphs Problem of the Day Riddle: When does 1 + 1 + 1 = 1? 1 ft + 1 ft + 1 ft = 1 yd

4. 7-4 Reading and Interpreting Circle Graphs MA.7.S.6.2 Construct and analyze…circle graphs. Sunshine State Standards

5. 7-4 Reading and Interpreting Circle Graphs Vocabulary circle graph sector

6. 7-4 Reading and Interpreting Circle Graphs 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.

7. 7-4 Reading and Interpreting Circle Graphs The circle graph compares the number of species in each group of echinoderms. Echinoderms are marine animals that live on the ocean floor.

8. 7-4 Reading and Interpreting Circle Graphs Use the circle graph to answer the question. Additional Example 1A: Life Science Application Which group of echinoderms includes the fewest number of species? The sector for sea lilies and feather stars is the smallest, so this group includes the fewest number of species.

9. 7-4 Reading and Interpreting Circle Graphs Use the circle graph to answer the question. Additional Example 1B: Life Science Application Approximately what percent of echinoderm species are brittle stars and basket stars? about, so approximately 33% 1313

10. 7-4 Reading and Interpreting Circle Graphs The circle graph compares the sales of different types of cars during one year. Approximately what percent of cars were midsize? Check It Out: Example 1A 50%

11. 7-4 Reading and Interpreting Circle Graphs Leon surveyed 30 people about pet ownership. The circle graph shows his results. Use the graph to answer each question. Additional Example 2A: Interpreting Circle Graphs How many people own dogs only? The circle graph shows that 20% of the 30 people own dogs only. 20% of 30 = 0.2 30 = 6 6 people own dogs only.

12. 7-4 Reading and 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. Additional Example 2B: Interpreting Circle Graphs How many people own both cats and dogs? Since 20% is 6 people, 10% is 3 people. 3 people own both cats and dogs.

13. 7-4 Reading and Interpreting Circle Graphs Check It Out: Example 2 Fifty students were asked which instrument they could play. The circle graph shows the responses. How many play the flute? 10% of 50 is 0.1 · 50 = 5; 5 students play the flute.

14. 7-4 Reading and Interpreting Circle Graphs A company reports its annual charitable contributions. Draw a circle graph to represent this data. Additional Example 3: Drawing a Circle Graph Step 1: Find the total dollars contributed. 120,000 + 60,000 + 120,000 + 96,000 + 84,000 = 480,000

15. 7-4 Reading and Interpreting Circle Graphs Additional Example 3 Continued Step 2: Find the percent each cause is to the whole. Education and Health EnvironmentDisaster Relief Arts & Humanties Step 3: Multiply the percent times 360 (the total number of degrees in a circle) for each contribution to find the measure of the central angle.

16. 7-4 Reading and Interpreting Circle Graphs Additional Example 3 Continued Step 4: Use a protractor to draw each angle inside a circle. Label each wedge with the corresponding percent.

17. 7-4 Reading and Interpreting Circle Graphs A group of track and field team members are asked which event is their favorite. Draw a circle graph to represent this data. Check It Out: Example 3 EventNumbers Sprints24 Hurdles18 Relay30 Jumping12 Throwing36

18. 7-4 Reading and Interpreting Circle Graphs Check It Out: Example 3 Continued

19. 7-4 Reading and Interpreting Circle Graphs Standard Lesson Quiz Lesson Quizzes Lesson Quiz for Student Response Systems

20. 7-4 Reading and Interpreting Circle Graphs 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? 4. If a total of 500 CD’s are sold, how many are Jazz? rock 27% rap 55 41%

21. 7-4 Reading and Interpreting Circle Graphs Lesson Quiz: Part II 5. Would a bar or circle graph best display the sales of a department store for the last 5 months? bar graph

22. 7-4 Reading and Interpreting Circle Graphs 1. The members of a club were asked to vote for their favorite holiday destination. The results are shown in the form of a circle graph. Which destination was preferred the most by the members? A. Portugal B. France C. Greece D. Spain Lesson Quiz for Student Response Systems

23. 7-4 Reading and Interpreting Circle Graphs 2. 300 students in a school play any one musical instrument. The circle graph shows what percentage of students play different instruments. How many students play guitar? A. 15 B. 36 C. 96 D. 144 Lesson Quiz for Student Response Systems

24. 7-4 Reading and Interpreting Circle Graphs 3. Which of the following would be the best display for the nutritional value of a food item? A. bar graph B. double bar graph C. histogram D. circle graph Lesson Quiz for Student Response Systems