The Key?
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Line graphs may represent equations, if they are defined for all values of a variable.
Circle graphs show data in a circle, while line graphs are akin to join the dots, and a bar graph shows data in vertical or horizontal bars, but all three show the same data results.
bar graphs are used to compare different data. a line graph is used to see the changes over a period of time of a specific data. a circle graph is used to represent a part to a whole relationship.
The "key" tells you what the line(s) of plotted data on a graph represent (e.g people, money, time etc...) without this information the graph is meaningless because it is incomprehensible.
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