Pie Graph or Pie Chart

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Sometimes a circle is used to represent a given data. The various parts of it are proportionally represented by sectors of the circle. Then the graph is called a Pie Graph or Pie Chart.

To find the angle of each sector

Total of data corresponds to 360^o.

Let x^o = the angle at the centre for item A, then

The data given in example 1 can be used to draw a pie graph.

Calculation of Angles

Food:

Angle at centre

= 150^o

Rent:

Angle at centre

= 40^o

Similarly we can calculate the remaining angles, and the total of angles column should always come to 360^o.

A survey was conducted to find out the consumption of various brands of soap. The results of the survey are given below:

(i) Soap Cake:

(ii) Soap Powder:

(i) Using the information given in the table for soap cake, draw a pie chart.

(ii) Using the angles in the pie chart for soap powder, complete the table that follows:

(i) Draw Pie Chart

Total of the items = 100

A. Angle at centre

= 216^o

B. Angle at centre

= 72^o

C. Angle at centre

= 54^o

Other Angle at centre

= 18^o

(ii) Complete the table

For P,

Similarly

Same way we can calculate the values of R, S and others.

R = 25%, S = Others =