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| 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. |
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| To find the angle of each sector |
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| Total of data corresponds to 360o. |
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| Let xo = the angle at the centre for item A, then |
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| The data given in example 1 can be used to draw a pie graph. |
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| Food: |
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Angle at centre  |
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| = 150o |
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| Rent: |
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Angle at centre  |
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| = 40o |
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| Similarly we can calculate the remaining angles, and the total of angles column should always come to 360o. |
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| A survey was conducted to find out the consumption of various brands of soap. The results of the survey are given below: |
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| (i) Soap Cake: |
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| (ii) Soap Powder: |
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| (i) Using the information given in the table for soap cake, draw a pie chart. |
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| (ii) Using the angles in the pie chart for soap powder, complete the table that follows: |
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| (i) Draw Pie Chart |
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| Total of the items = 100 |
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| A. Angle at centre |
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| = 216o |
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B. Angle at centre  |
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| = 72o |
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C. Angle at centre  |
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| = 54o |
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Other Angle at centre  |
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| = 18o |
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| (ii) Complete the table |
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| For P, |
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Similarly  |
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| Same way we can calculate the values of R, S and others. |
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R = 25%, S =  Others =  |
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