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Pie graphs are used when the entire circle is divided into percentage.  Each pie is a fraction or percentage of 100%. A circle or pie graph is used to show how a part of something related to the whole. This kind of graph shows percentages effectively.

Bar graphs are display real numbers to compare different categories in a very visual manner.  A bar graph is used to show relationships between groups. The two items being compared do not need to affect each other. It's a  way to show big differences.

A line graph depends on how the axis is defined in the x and y direction.   The line graph uses the Cartesian coordinates system which helps predict results.  A line graph is used to show continuing data and how one thing is affected by another. It's clear to interpret how things are going by the rises and falls a line graph shows. This kind of graph is needed to show the effect of an independent variable on a dependent variable.

 Bar graphs easily show growth Line Graph
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