Question

The following table shows causes of noise pollution. Complete the table to draw a pie diagram.

Causes	Percentage	Central angle
Construction	10%	`square`
Traffic	`square`	180°
Aircraft take off	9%	`square`
Industry	20%	`square`
Trains	11%	39.6

Answer 1

1. Construction

Given percentage = 10%

Central angle = `10/100 xx 360^circ = 36^circ`

2. Traffic

Given central angle = 180°

Percentage = `(180^circ)/(360^circ) xx 100 = 50%`

3. Aircraft take off

Given percentage = 9%

Central angle = `9/100 xx 360^circ = 32.4^circ`

3. Industry

Given percentage = 20%

Central angle = `20/100 xx 360^circ = 72^circ`

Completed the table

Causes	Percentage	Central angle
Construction	10%	\[\boxed{36°}\]
Traffic	\[\boxed{50\%}\]	180°
Aircraft take off	9%	\[\boxed{32.4°}\]
Industry	20%	\[\boxed{72°}\]
Trains	11%	39.6°