Revision: Term - 1 >> Information Processing Mathematics Tamil Nadu Primary School Class 4 Tamil Nadu Board of Secondary Education

A Pictograph is a chart that uses pictures or symbols to represent data. Each picture stands for a specific number of items, making the data easy to understand at a glance.

A circular diagram divided into sectors whose angles are proportional to the corresponding data values is called a pie diagram or pie chart.

• The complete circle represents the total value and measures 360°.

• Each sector represents one component of the total.

• A larger component produces a larger sector.

• Equal components produce equal sectors.

\[\text{Central angle}=\frac{\text{Value of component}}{\text{Total value}}\times360^\circ\]

Symbol Form

Let:

\[ x \] = component value

\[ T \] = total value, where \[ T > 0 \]

\[ \theta \] = central angle

Then:

\[ \theta = \frac{x}{T} \times 360^{\circ} \]

• A pie diagram represents data using a circle.

• The whole circle = total data = 360°.

• Each part of the data is shown by a sector.

• The central angle of a sector is proportional to the data value.

• Larger value → larger sector, smaller value → smaller sector.