The following data shows the expenditure of a person on different items during a month. Represent the data by a pie-chart.
|Items of expenditure||Rent||Education||Food||Clothing||Others|
|Amount (in Rs)||2700||1800||2400||1500||2400|
Central angle of a component = (component value/sum of component values
Here, total amount = Rs 10800
Thus, the central angle for each component can be calculated as follows:
|Item||Amount (in Rs)||Sector angle|
Total : 10800 (in Rs)
Now, the pie chat representing the given data can be constructed by following the steps below:
Step 1 : Draw circle of an appropriate radius.
Step 2 : Draw a vertical radius of the circle drawn in step 1.
Step 3 : Choose the largest central angle. Here, the largest central angle is 90o. Draw a sector with the central angle 90o in such a way that one radius coincides with the radius drawn in step 2 and another radius is in its counter clockwise direction.
Step 4 : Construct other sectors representing other items in the clockwise direction in descending order of magnitudes of their central angles.
Step 5 : Shade the sectors with different colours and label them, as shown as in the figure below.