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Lesson 10-2 Pages 418-421
Making Circle Graphs
What you will learn!
How to construct and interpret circle graphs.
Circle graphCircle 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.
SportSport PercentPercent
FootballFootball 30%30%
BasketballBasketball 25%25%
BaseballBaseball 22%22%
TennisTennis 8%8%
OtherOther 15%15%
SportSport PercentPercent Degrees of CircleDegrees of Circle
FootballFootball 30%30% 360 x .3 = 108360 x .3 = 108°°
BasketballBasketball 25%25% 360 x .25 = 90360 x .25 = 90°°
BaseballBaseball 22%22% 360 x .22 = 79.2360 x .22 = 79.2°°
TennisTennis 8%8% 360 x .08 = 28.8360 x .08 = 28.8°°
OtherOther 15%15% 360 x .15 = 54360 x .15 = 54°°
15% Other
30% Football25%
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 MovieType of Movie NumberNumberActionAction 2424
ComedyComedy 1515Science FictionScience Fiction 77
Type of MovieType of Movie NumberNumberActionAction 2424
ComedyComedy 1515Science FictionScience Fiction 77
PercentPercent52% (0.52)52% (0.52)33% (0.33)33% (0.33)15% (0.15)15% (0.15)
DegreesDegrees187187°°119119°°5454°°
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%
Republicans42%
Democrats55%
More than half are Democrats and only
a very few are Independents.
Page 420
Guided Practice
#’s 3-6
Pages 418-419 with someone at home and study
examples!
Read:
Homework: Page 420-421
#’s 7, 8, 10-13
#’s 17-26 all
Lesson Check 10-2
Page
587
Lesson 10-2
Navy
Sky/L-Blue
Aqu
amar
ine
Other
55 mph
65 mph
70 mph 75 mph
Driving Alone
Carpool
Public Transit
Other
Driving Alone
Car
pool
Public Transit
Other
Mammals
Birds Reptiles
Amphibians
Northeast
Midwest
South West