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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.
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.
The first pie chart shows 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