Page 544 - Basic College Mathematics with Early Integers

7.2 READING CIRCLE GRAPHS Objectives

Read Circle Graphs.

Objective Reading Circle Graphs Draw Circle Graphs.

In Exercise Set 6.1, the following circle graph was shown. This particular graph
shows the favorite sport of 100 adults.

Volleyball, 3 Other, 4
Golf, 8

Soccer, 13 Football,
37

Baseball, 15

Basketball, 20

Each sector of the graph (shaped like a piece of pie) shows a category and the rela-
tive size of the category. In other words, the most popular sport is football, and it is
represented by the largest sector.

Example 1 Find the ratio of adults preferring basketball to total adults.Write PRACTICE 1
the ratio as a fraction in simplest form. Find the ratio of adults prefer-
Solution: The ratio is ring golf to total adults.Write
the ratio as a fraction in sim-
people preferring basketball 20 1 plest form.
= =
total adults 100 5
Work Practice 1

A circle graph is often used to show percents in different categories, with the
whole circle representing 100%.

Example 2 Using a Circle Graph PRACTICE 2
Using the circle graph shown
The graph to the right shows the percent Visitors to U.S. by Region in Example 2, determine the
of visitors to the United States in a recent percent of visitors to the
year from various regions. Using the circle Europe United States that came from
graph shown, determine the percent of Other 7.7% 25.3% Europe,Asia, and South
visitors who came to the United States America.
from Mexico and Canada. Mexico
12.3%
Solution: To find this percent, we add
the percents corresponding to Mexico Asia
and Canada.The percent of visitors to the 12.2%
United States that came from Mexico and
Canada is South
America Answers
12.3% + 37.5% = 49.8% Canada 5.0%
37.5% 2
1.
25
Work Practice 2 Source: Office of Travel and Tourism Industries 2. 42.5%
521