Pie Charts

Pie Charts are also called Circle Graphs and Sector Graphs. They are best for displaying a small number of discrete categories. A common example is the display of opinion poll results being Yes/No (only two categories).

The procedure for creating a pie chart is:


Example - Wildlife Smuggling in Ecuador

Macaw

Ecuador in South America has a wide biodiversity of colourful birds, but also spends few government funds to stop wildlife smuggling. Below is a table showing the most commonly smuggled animals, most of whom die before reaching their destination. Draw a pie chart of this data.

SMUGGLED ANIMALNUMBER SMUGGLED IN ONE WEEK
Macaw35
Jaguar4
Capuchin monkey64
Spider monkey47

Answer:

SMUGGLED ANIMALNUMBER SMUGGLED IN ONE WEEKWORKING ANGLE
Macaw3535150 × 360 = 8484 degrees
Jaguar44150 × 360 = 9.610 degrees
Capuchin monkey6464150 × 360 = 153.6154 degrees
Spider monkey4747150 × 360 = 112.8113 degrees
TOTAL150

Pie Chart diagram

Question

When 100 people were surveyed as to whether the government should spend more money to prevent wildlife smuggling, the responses were:

Draw a pie chart with this information.

Did You Know That...?

Democracy in Ancient Greece where the concept originated was quite different to our contemporary understanding of the term. To be eligible to vote, a person had to be a male born in Athens and over 20 years old. Women and slaves were not permitted to cast their votes.