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:
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 ANIMAL||NUMBER SMUGGLED IN ONE WEEK|
|SMUGGLED ANIMAL||NUMBER SMUGGLED IN ONE WEEK||WORKING||ANGLE|
|Macaw||35||35⁄150 × 360 = 84||84 degrees|
|Jaguar||4||4⁄150 × 360 = 9.6||10 degrees|
|Capuchin monkey||64||64⁄150 × 360 = 153.6||154 degrees|
|Spider monkey||47||47⁄150 × 360 = 112.8||113 degrees|
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.
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.