1. Pettit 10-2 Notes D1: Read and interpret graphs
10-2 Circle Graphs
D1: Read and interpret graphs

2. Circle Graphs: Show parts to a whole All circle graphs represent 100%
Good for showing survey results
100%
50%
33.3%
33.3%
25%
25%
33.3%

3. Steps to create a circle graph
Find the percent that each part represents
(if not given)
Convert the percentage to degrees of the circle Example: 18% of 360 = 0.18 •360 ≈ 65°
Draw a radius from the center to the side of circle
Measure the given degree by lining up protractor with that radius
Repeat with remaining sectors
Label the sections with the percents & category and give the graph a title

4. Example: US (1896-2000) Olympic Medals
Type
Number
Gold
872
Silver
658
Bronze
587 %
Angles (°)
2,117
100%
360°
Add two Columns to table and label % and angle
Use steps to create the circle graph
How many total medals have been won?

5. US ( ) Olympic Medals %
Angles (°)