Pie Chart
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![Page 1: Pie Chart](https://reader038.fdocuments.in/reader038/viewer/2022100600/55647152d8b42a5b318b4b7d/html5/thumbnails/1.jpg)
PIE CHARTS PIE CHARTS
Calculating angles and percentagesCalculating angles and percentages
![Page 2: Pie Chart](https://reader038.fdocuments.in/reader038/viewer/2022100600/55647152d8b42a5b318b4b7d/html5/thumbnails/2.jpg)
Materials needed• Classwork book (to copy notes)• Protractor• Pair of compasses• Pencil• Ruler• Eraser
![Page 3: Pie Chart](https://reader038.fdocuments.in/reader038/viewer/2022100600/55647152d8b42a5b318b4b7d/html5/thumbnails/3.jpg)
Lesson Objective• To be able to draw a pie chart by
calculating the degrees for each sector from a set of given data
• To be able to calculate the percentage for each sector from a set of given data
![Page 4: Pie Chart](https://reader038.fdocuments.in/reader038/viewer/2022100600/55647152d8b42a5b318b4b7d/html5/thumbnails/4.jpg)
Why Pie charts?• A pie chart is a good way of displaying
data when you want to show how something is shared or divided.
![Page 5: Pie Chart](https://reader038.fdocuments.in/reader038/viewer/2022100600/55647152d8b42a5b318b4b7d/html5/thumbnails/5.jpg)
How do we calculate angles?
• Twenty students were asked on which day they would paint the scenery for the school play. The replies were:
• Monday - 5• Tuesday - 4• Wednesday - 8• Thursday 3
![Page 6: Pie Chart](https://reader038.fdocuments.in/reader038/viewer/2022100600/55647152d8b42a5b318b4b7d/html5/thumbnails/6.jpg)
Remember!!!• The angles at the centre of a pie chart
MUST add up to 360º
![Page 7: Pie Chart](https://reader038.fdocuments.in/reader038/viewer/2022100600/55647152d8b42a5b318b4b7d/html5/thumbnails/7.jpg)
Calculation• 20 students are represented by 360º• One student is represented by 360º = 18º 20Monday = 5 x 18º = 90º
Tuesday = 4 x 18º = 72º
Wednesday = 8 x 18º = 144º
Thursday = 3 x 18º = 54º
![Page 8: Pie Chart](https://reader038.fdocuments.in/reader038/viewer/2022100600/55647152d8b42a5b318b4b7d/html5/thumbnails/8.jpg)
Now….• Draw the pie chart representing the
students
• Show the key and angle of each sector.
• Then, calculate the percentage of each parts.
![Page 9: Pie Chart](https://reader038.fdocuments.in/reader038/viewer/2022100600/55647152d8b42a5b318b4b7d/html5/thumbnails/9.jpg)
Peer Assessment• Ask your friends to check your workings:
– Circle (1 point)– Correct angles and sector (4 points)– Key shown for days (1 point)– Percentage shown (4 points)
• Total up the number of points (max=10)• 8 - 10 points = 3 stars• 5 - 7 points = 2 stars• 2 - 4 points = 1 star
![Page 10: Pie Chart](https://reader038.fdocuments.in/reader038/viewer/2022100600/55647152d8b42a5b318b4b7d/html5/thumbnails/10.jpg)
Well Done!!!• How well did you do in this exercise?
• How many stars did you get?
• Anyone got 3 stars?