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Question
The following table shows the daily supply of electricity to different places in a town. To show the information by a pie diagram, measures of central angles of sectors are to be decided.
Complete the following activity to find the measure :
| Places |
Supply of electricity |
Measure of central angle |
| Roads | 4 | `4/30 xx 360 = 48^circ` |
| Factories | 12 | `square/square xx 360 = 144^circ` |
| shops | 6 | `6/30 xx 360 = square` |
| Houses | 8 | `square/square xx 360 = square` |
| Total ⇒ | 30 | `square` |
Solution
| Places |
Supply of electricity |
Measure of central angle |
| Roads | 4 | `4/30 xx 360 = 48^circ` |
| Factories | 12 | `bb12/bb30 xx 360 = 144^circ` |
| shops | 6 | `6/30 xx 360 = bb(72^circ)` |
| Houses | 8 | `bb8/bb30 xx 360 = bb(96^circ)` |
| Total ⇒ | 30 | `bb(360^circ)` |
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