Reading and Interpreting 7 4 Circle Graphs Warm

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

Reading and Interpreting 7 -4 Circle Graphs Warm Up Write each fraction as a percent. 1 3 75% 1. 4 2. 3. 10 10% Write each percent as a fraction. 1 1 4. 20% 5 5. 25% 6. 60% 4 2 5 40% 3 5

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

Reading and Interpreting 7 -4 Circle Graphs Sunshine State Standards MA. 7. S. 6. 2 Construct and analyze…circle graphs.

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

Reading and Interpreting 7 -4 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.

Reading and Interpreting 7 -4 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.

Reading and Interpreting 7 -4 Circle Graphs Additional Example 1 A: Life Science Application Use the circle graph to answer the question. 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.

Reading and Interpreting 7 -4 Circle Graphs Additional Example 1 B: Life Science Application Use the circle graph to answer the question. Approximately what percent of echinoderm species are brittle stars and basket stars? about 1 , so approximately 33% 3

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

Reading and Interpreting 7 -4 Circle Graphs Additional Example 2 A: 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? 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.

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

Reading and Interpreting 7 -4 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.

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

Reading and Interpreting 7 -4 Circle Graphs Additional Example 3 Continued Step 2: Find the percent each cause is to the whole. 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. Arts & Education and Health Humanties Environment Disaster Relief

Reading and Interpreting 7 -4 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.

Reading and Interpreting 7 -4 Circle Graphs Check It Out: Example 3 A group of track and field team members are asked which event is their favorite. Draw a circle graph to represent this data. Event Numbers Sprints 24 Hurdles 18 Relay 30 Jumping 12 Throwing 36

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

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

Reading and Interpreting 7 -4 Circle Graphs Lesson Quiz: Part I Use the circle graph to answer questions 1 -4. 1. Which group of CDs sold the most? rock 2. What percent of the CD sales are country? 27% 41% 3. Which type of CD sells the least? rap 4. If a total of 500 CD’s are sold, how many are Jazz? 55

Reading and Interpreting 7 -4 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

Reading and Interpreting 7 -4 Circle Graphs Lesson Quiz for Student Response Systems 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

Reading and Interpreting 7 -4 Circle Graphs Lesson Quiz for Student Response Systems 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

Reading and Interpreting 7 -4 Circle Graphs Lesson Quiz for Student Response Systems 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