1. Venn Diagrams &
Circle Graphs & Line Graphs

2. To make a circle graph:
Collect data
Find the percent of each category
Find the measure of the central angle for
each category
Use a protractor to make the circle graph

3. Are you good Tally Frequency
at fractions?
Yes
No
Sometimes

4. Find the percent of each category
(100% total):
Yes =
No =
Sometimes =

5. Find the measure of each central
angle (360° total):
Yes
No
Sometimes

6. Use a protractor to make the circle
graph:

7. Venn Diagram Example
Survey of 50 people who have a pet. 24 people have a
dog. 18 people have a cat. 12 people have fish. 4
people have fish and a cat. 1 person has a fish and a
dog. 3 people have a dog and a cat. 5 people have a
fish, a cat and a dog. How many people don’t have any
of these pets?
Cat Dog
___
___ ___
___
___ ___
___
Fish

8. Line Graph
Consists of
paired values graphed as points on a
plane defined by an x- and y-axis;
line segments connecting the graphed
points (much like a dot-to-dot).
Works well when
the data is paired (bi-variate);
the data is continuous.

9. Line Graph Example
75
74
73
John's Weight in Kilograms
72
71
70
69
68
67
66
65
1991 1992 1993 1994 1995
Year
John weighed 68 kg in 1991, 70 kg in 1992, 74 kg in
1993, 74 kg in 1994, and 73 kg in 1995.

10. Advantages of Line Graphs
A line graph is a way to summarize how two
pieces of information are related and how they
vary depending on one another.
Disadvantages of Line Graphs
Changing the scale of either axes can
dramatically change the visual impression of the
graph.