When the volume of the data is large then considering both length and breadth, a diagram drawn is called two dimensional diagram.

• In two dimensional diagrams the total value is shown as an area.
• Square, rectangle, circle, pie diagram are two dimensional diagrams.

Circle diagram: When the volume of the data regarding two or more places, things or times is large, then circle diagrams are drawn for such data.

• In circle diagram, square roots of the volume of different data are taken as the radius of circle. Arranging the radius in ascending or descending order, circles are drawns with centers on the same line at equal distance from each other. When the data on time are given then circles are drawn in order of time only.
• If the square root of the volume is too large, then divide by a constant and if it is too small then multiply by a constant. In this manner determine the radius.

Pie diagram: If the data on different places, things or times consist of several mutually related sub-data are numerically large, pie diagram is drawn.

• In this diagram, the total volume of the data is represented by a circle of suitable radius and this circle is divided into sectors in accordance with sub-data.
• Here, total volume of the data is taken as 360° and the volume of sub-data are expressed in terms of measures of angle and are presented on circle with respective circular sectors.