What is pie diagram?

Understand Pie Diagram. Click on the link to Watch the VIDEO explanation: 
Watch Video

Pie Diagram
A pie diagram or a pie chart is one of the forms of graphical representation of statistical data.
A pie diagram consists of a circle divided into sectors, each sector represents numerical data.
let us understand a pie diagram with an example 
There are 60 students in a class. 10 of them passed in first grade, 25 in second grade, 20 in the third grade and students failed . Show this information on a pie diagram.
Solution:
Total number of students is equal to 60 degrees
Now, let consider the first case,
10 students passed in the first grade,
Total measure of circle is equal to Total number of students
Therefore, 360 degrees is equal to 60 students
Measure of sector is equal to 10 by 60 into 360 degrees equal to 60 degrees.
Now, let us draw the pie diagram representing this.
Draw a circle of any convenient radius with centre O.
Draw a radius OA.
Draw an angle 60 degrees, with the help of a protector, keeping it on OA.
Similarly, we shall find the measures of the number of students who passed in second and third grades and also for the number of students who have failed.