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Histogram or Bar Chart

These graphs use columns to show the variable. In the histogram below each column represents the mass of water lost by a plant over a four hour period.

 

Histogram

The Pie Chart

Pie charts are quite easy to draw. You need a compass and a protractor. Pie charts are used to show proportions, for example percentages. the whole disc of the pie chart represents 100%. A circle is divided into 360 degrees which you can measure using your protractor.

1% = 3,6 degrees
10% = 3,6 x 10 = 36 degrees
25% = 3,6 x 25 = 90 degrees
and so on

The first pie chart shows the diet of a Leopard seal.

The Diet of a Leopard Seal

The Diet of a Leopard Seal

The second pie chart shows the diet of a Stellar Sea Lion

The Diet of a Stellar Sea Lion

The Diet of a Stellar Sea Lion

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