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Line graphs can also be used to compare changes over the same period of time for more than one group. Pie charts are best to use when you are trying to compare parts of a whole. They do not show changes over time. Bar graphs are used to compare things between different groups or to track changes over time.
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a pie chart is round and is used to compare data, bar chart are bars and are used to graph frequencies or amounts and a line graph shows a trend in data 

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