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Question

The following data shows the expenditure of a person on different items during a month. Represent the data by a pie-chart.

Items of expenditureRentEducationFoodClothingOthersAmount (in Rs)27001800240015002400

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Solution

We know that,

Central angle of a component =component valuesum of component values×360

Here, total amount =Rs. 10800

Thus, the central angle for each component can be calculated as follows:

ItemAmount (in Rs)Sector angleRent2700270010800×360=90Education1800180010800×360=60Food2400240010800×360=80Clothing1500150010800×360=50Others2400240010800×360=80

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 90

. Draw a sector with the central angle 90.

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.​​



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