The chapter consists of Construction of making a pie chart or graph from the given data. The pie chart is a circular statistical graphic to show relative sizes of data. In this chapter, we shall learn about the diagrammatic representation of data. There are a wide variety of diagrams in use; we mainly focus on pie-diagrams or pie-charts or circle graphs to represent the given data. We will discuss a particular type of diagram known as pie-diagrams or pie-charts or circle graphs to represent the data. Additionally, reading of pie-charts is added in this chapter where we shall see how the desired information can be ascertained from a given pie-chart.