4. 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 measures :
Places Supply of electricity (Thousand units) Measure of the central angle 4 Roads 4 x 360° = 48° 30 Factories 12 x 360° = 144° Shops 6 6 x 360° 30 Houses 8 X 360° Total = 30 360°
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Factories is 12/30 × 360 = 144.
shops is = 72
houses is 8/30 × 360 = 96
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