Lesson 10-2 Pages Making Circle Graphs

What you will learn! How to construct and interpret circle graphs.

Circle graph

What you really need to know! A graph used to compare parts of a whole is called a circle graph. In a circle graph, the percents add up to 100. When percents are not given, you must first determine what part of the whole each item represents.

Example 1: In a survey, a group of middle school students were asked to name their favorite sport. The results are shown in the table. Make a circle graph of the data. SportPercent Football30% Basketball25% Baseball22% Tennis8% Other15%

SportPercent Degrees of Circle Football30% 360 x.3 = 108° Basketball25% 360 x.25 = 90° Baseball22% 360 x.22 = 79.2° Tennis8% 360 x.08 = 28.8° Other15% 360 x.15 = 54°

15% Other 30% Football 25% Basketball 22% Baseball 8% Tennis

Example 2: Gina has the following types of movies in her DVD collection. Make a circle graph of the data. Type of Movie Number Action24 Comedy15 Science Fiction 7

Type of Movie Number Action24 Comedy15 Science Fiction 7Percent 52% (0.52) 33% (0.33) 15% (0.15) Degrees 187° 119° 54°

52% Action 33% Comedy 15% Science Fiction

Example 3: The circle graph shows the percent of voters in a town who are registered with a political party. Use the graph to describe the voters in this town.

Independent/ Others 3% Republicans 42% Democrats 55% More than half are Democrats and only a very few are Independents.

Page 420 Guided Practice #’s 3-6

Pages with someone at home and study examples! Read:

Homework: Page #’s 7, 8, #’s all Lesson Check 10-2

Page 587 Lesson 10-2

Navy Sky/L-Blue Aquamarine Other

55 mph 65 mph 70 mph 75 mph

Driving Alone Carpool Public Transit Other

Driving Alone Carpool Public Transit Other

Mammals Birds Reptiles Amphibians

Northeast Midwest South West