The following data gives the amount spent on the construction of a house. Draw a pie diagram.
| Items | Cement | Timber | Bricks | Labour | Steel | Miscellaneous |
| Expenditure (in thousand Rs) |
60 | 30 | 45 | 75 | 45 | 45 |
We know:
Central angle of a component $=$ (component value/sum of component values $\times 360^{\circ}$ )
Here. the total expenditures = 300 (in thousand Rs)
Thus the central angle for each component can be calculated as follows:
| Item | Expenditure (in thousand Rs) |
Sector angle |
| Cement | 60 | 60/300 |
| Timber | 30 | 30/300 |
| Bricks | 45 | 45/300 |
| Labour | 75 | 75/300 |
| Steel | 45 | 45/300 |
| Miscellaneous | 45 | 45/300 |
Total expenditure: 300 (in thousand Rs)
Now, the pie chat representing the given data can be constructed by following the steps below:
Step 1 : Draw circle of an appropriate radius.
Step 2 : Draw a vertical radius of the circle drawn in step 1.
Step 3 : Choose the largest central angle. Here the largest central angle is 90o. Draw a sector with the central angle 90o in such a way that one of its radii coincides with the radius drawn in step 2 and another radius is in its counter clockwise direction.
Step 4 : Construct other sectors representing the other items in the clockwise direction in descending order of magnitudes of their central angles.
Step 5 : Shade the sectors with different colours and label them, as shown as in figure below.