Draw a pie chart showing the following information. The table shows the colours preferred by a group of people. Colours Number of people Blue 18 Green 9 Red 6 Yellow 3 Total 36 Find the proportion of each sector. For example, Blue is 18/36=1/2; Green is 9/36=1/4 and so on. Use this to find the corresponding angles.
Solution:
Central angle: Blue →18/36 × 360o=180o Green →9/36 × 360o=90o Red →6/36 × 360o=60o Yellow →3/36 × 360o=30o