Circle Graphs A step by step how to.

Example 1 A software company asked 60 owners what they use their computers for most. Of these owners, 21 said word processing, 18 said spreadsheets, 6 said Internet access, and 15 had other responses. Use a circle graph to display these results.

Step 1: Organize the data in a table. NumberPercentAngle Measure Word Processing 21 Spreadsheets18 Internet access6 Other15 TOTAL60

Step 2: Find the percent of computer owners giving each response. NumberPercent (Fraction x 100) Angle Measure Word Processing 2121 x 100 = 35% 60 Spreadsheets1818 X 100 = 30% 60 Internet access66 X 100 = 10% 60 Other1515 X 100 = 25% 60 TOTAL % Remember to find percent set it up as follows…Part x 100 = Percent Whole

Step 3: Use these percents to find the angle measures of the sectors of the circle graph. NumberPercentAngle Measure Word Processing 2135% Spreadsheets1830% Internet access610% Other1525% TOTAL60 100% 360º To find the angle measure, multiply the percent by 360º x 360º = 126º 0.30 x 360º = 108º 0.10 x 360º = 36º 0.25 x 360º = 90º

Step 4: Use a compass to draw a circle..

Step 5: Use a protractor to draw sectors having the angle measures found in step º

Word Processing 108º Step 5: Use a protractor to draw sectors having the angle measures found in step 3. Label each sector with the corresponding response & percent. 35%

Step 5: Use a protractor to draw sectors having the angle measures found in step 3. Word Processing Spreadsheets 36º Label each sector with the corresponding response & percent. 35% 30%

Step 5: Use a protractor to draw sectors having the angle measures found in step 3. Word Processing Spreadsheets Internet access Label each sector with the corresponding response & percent. 35% 30% 10% 90º

Step 5: Use a protractor to draw sectors having the angle measures found in step 3. Word Processing Spreadsheets Internet access Label each sector with the corresponding response & percent. 35% 30% 10% 25% Other

Step 6: Title your circle graph. Word Processing Spreadsheets Internet access 35% 30% 10% 25% Other Computer Use

Example 2 Recently, in our afternoon tutoring we counted the candy colors in a 1 pound bag of M & M’s. We came up with the following data… red = 109 blue = 51 green = 23 yellow = 95 brown = 31 orange = 46 purple = 61 Make a circle graph to show the percent of each color of the M & M’s in the 1 pound bag.