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 1A: Life Science Application
Use the circle graph to answer the question.
Which group of
echinoderms includes
the fewest number of
species?
Reading and Interpreting
7-4 Circle Graphs
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?
Reading and Interpreting
7-4 Circle Graphs
Check It Out: Example 1A
The circle graph compares the sales of different
types of cars during one year. Approximately
what percent of cars were midsize?
Reading and Interpreting
7-4 Circle Graphs
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?
Reading and Interpreting
7-4 Circle Graphs
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?
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?
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.
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