Question:
The following table shows the percentages of buyers of four different brands of bathing soaps.
Represent the above data by a pie chart.
Solution:
Total percentage $=100$
Central angle of each brand $=\left(\frac{\text { value (in \%) of each brand }}{100} \times 360\right)^{\circ}$
Calculation of central angles :
Construction of pie chart
Steps of construction:
1. Draw a circle of any convenient radius.
2. Draw a horizontal radius of the circle.
3. Draw sectors whose central angles are $72^{\circ}, 144^{\circ}, 90^{\circ}$ and $54^{\circ}$.
4. Shade the sectors so obtained differently and label each one of them.
Thus, we obtain the required pie chart as shown in the figure below.
