In this blog, we will discuss pie chart also known as a circle graph. Have you ever come across data represented in a circular form? 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.
We can say that a pie chart is a circular diagram, used to show the breakup of total amount into component parts. It shows the percentage values as a slice of pie.
Drawing pie charts
Here we will see how we can draw pie charts.
The favorite flavors of ice-creams for students of a school are given in percentages as follows. Chocolate 50 percent, Vanilla 25 percent, and other flavors 25 percent.
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�. We make a table to find the central angle of the sectors.
Now we will convert the given percentages into fractions. For this, we will divide the given percentage by 100 and simplify. To find the portion of the circle multiply the fractions with 360 degrees.
Now let's construct the pie chart.
1. Draw a circle with any convenient radius. Mark its center (O) and a radius (OA).
2. The angle of the sector for chocolate is 180�.
Use the protractor to draw angle ??AOB = 180�.
3. Similarly for the Vanilla flavor and other flavors draw the angles of 90 degrees and complete the pie chart.
In the corresponding sectors write the name of quantities they represent.
Now let us take another example to make a pie chart.
On a particular day, the sales (in rupees) of different items in a baker�s shop are given below. Draw a pie chart for this data.
Solution: We find the central angle of each sector. Here the total sale = Rs 720.