Data Handling - Maths Class 8th - PIE CHARTS- Chapter 5 - NCERT - CBSE
Data Handling - Maths Class 8th - Pie Charts - Circle Graph - Chapter 5 - NCERT - CBSE
Full Introduction on Data Handling, fully solved. This is a video tutorial for 8th class NCERT CBSE students. For other educational stuff, subscribe and press bell icon.
Circle Graph or Pie Chart
Have you ever come across data represented in circular form as shown. These are called circle graphs. A circle graph shows the relationship between a whole and its parts. Here, the whole circle is divided into sectors. The size of each sector is proportional to the activity or information it represents.
Similarly, the size of other sectors can be found. Add up the fractions for all the activities. Do you get the total as one? A circle graph is also called a pie chart.
Drawing pie charts
The favourite flavours of ice-creams for students of a school is given in percentages as follows.Let us represent this data in a pie chart. The total angle at the centre of a circle is 360°. The central angle of the sectors will be. a fraction of 360 degrees. We make a table to find the central angle of the sectors.
1. Draw a circle with any convenient radius. Mark its centre (O) and a radius (OA).
2. The angle of the sector for chocolate is 180 degrees. Use the protractor to draw angle AOB = 180 degrees.
3. Continue marking the remaining sectors.
Example 1: Adjoining pie chart (Fig 5.7) gives the expenditure (in percentage) on various items and savings of a family during a month. (i) On which item, the expenditure was maximum? (ii) Expenditure on which item is equal to the total savings of the family? (iii) If the monthly savings of the family is Rs 3000, what is the monthly expenditure on clothes?
Solution: (i) Expenditure is maximum on food. (ii) Expenditure on Education of children is the same (i.e., 15 percent) as the savings of the family.
Example 2: On a particular day, the sales (in rupees) of different items of a baker’s shop are given below. Solution: We find the central angle of each sector. Here the total sale = Rs 720. We thus have this table. Now, we make the pie chart.
THINK, DISCUSS AND WRITE Which form of graph would be appropriate to display the following data. 1. Production of food grains of a state.
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