Water use in Australia.

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Presentation transcript:

Water use in Australia

Making a pie chart We need an easy way of displaying the water consumption per state or territory in Australia A pie chart is a really good way to show relative sizes It means we can see at a glance which one uses the most water

Your Task Create a pie chart using the information you have been given. Use the following steps to help you:

Step 1 Put your data into a table like the one below: WA SA TAS VIC NSW QLD Total

Step 2 Next, divide each value by the total and multiply by 100 to get a percent: WA SA TAS VIC NSW QLD Total 1.4 1.1 0.5 2.4 4.3 3.1 12.8 1.4/12.8x100 = 1.1/12.8 x100 0.5/12.8 2.4/12.8 4.3/12.8 3.1/12.8 100% To one decimal place

Step 3 We need to figure out how many degrees for each sector. A Full Circle has 360 degrees, so we do this calculation: WA SA TAS VIC NSW QLD Total 1.4 1.1 0.5 2.4 4.3 3.1 12.8 1.4/12.8x100 =10.9% 1.1/12.8 x100 =8.6% 0.5/12.8 =3.9% 2.4/12.8 =18.8% 4.3/12.8 =33.6% 3.1/12.8 =24.2% 100% 10.9x3.6° = 8.6x3.6° 3.9x3.6° 18.8x3.6° 33.6x3.6° 24.2x3.6° 360° To two decimal places.

Step 4 Now you are ready to start drawing. Draw a circle then use your protractor to measure the degrees of each sector.

WELL DONE! You can now draw a pie chart!! What does the pie chart you have drawn tell you about water usage in Australia?