Pie Charts

A pie chart can be used to represent all types of variables, but is more commonly used for categorical variables.

The data is represented in a circle and the angle of each circular sector is proportional to the corresponding absolute frequency.

Pie Charts Angles Forumla

The pie chart can be constructed with the help of a protractor.


In a class of 30 students, 12 play basketball, 3 swim, 9 play football and the rest do not practice any sport.

Pie Chart Calculations

  Students Angle
Basketball 12 144°
Swimming 3 36°
Football 9 108°
No sport 6 72°
Total 30 360°

Pie Chart