In a tree plantation programme, the number of trees planted by students of different classes is given in the following table. Draw a pie diagram showing the information.
| Standard | 5th | 6th | 7th | 8th | 9th | 10th |
|---|---|---|---|---|---|---|
| No. of trees | 40 | 50 | 75 | 50 | 70 | 75 |
Answer: Central angles – 5th: 40°, 6th: 50°, 7th: 75°, 8th: 50°, 9th: 70°, 10th: 75°
| Component | Value | Measure of central angle |
|---|---|---|
| 5th | 40 | \(\frac{40}{360} \times 360^\circ = 40^\circ\) |
| 6th | 50 | \(\frac{50}{360} \times 360^\circ = 50^\circ\) |
| 7th | 75 | \(\frac{75}{360} \times 360^\circ = 75^\circ\) |
| 8th | 50 | \(\frac{50}{360} \times 360^\circ = 50^\circ\) |
| 9th | 70 | \(\frac{70}{360} \times 360^\circ = 70^\circ\) |
| 10th | 75 | \(\frac{75}{360} \times 360^\circ = 75^\circ\) |
| Total | 360 | \(360^\circ\) |
Draw a circle of any convenient radius and one radius in it. Using a protractor, draw sectors with the above central angles one after the other, and write the name of each component in its sector.
Here the total is 360, so each central angle in degrees equals the number of trees.
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