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The line and the bar graph is used to describe a graph that compares two sets of data.
The plotting of data on a graph is used to observe, and subsequently describe, visible patterns that exist within the data.
a "circle graph" is also a polar graph, it's used to graph polar coordinates.
A graph is a representation of a thing/system, and can be used to test a hypothesis. For example, if you have a graph of a trend you can find the function of that trend. Then, you can plug in values the graph defines--say, at 2 the graph reaches 5--and if the function works, you know you have modeled the phenomenon correctly. This function testing can work to test a hypothesis, especially in finding trends.
circle graph