There are two common ways to graph circles: using a cartesian graph and using a polar graph.
For a cartesian graph, there are two familiar axes x and y which are orthogonal to each other. The formula for a circle is "x^2 + y^2 = a constant".
In a polar graph, there are no axes and all points are defined by their radius from the center point, and the angle of the direction the point lies from the center.
In a polar coordinate system, a circle is simply "r = a constant".
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you draw a circle and then put it on a graph
because its a circular graph?
A circle graph shows the different parts of a whole quantity.-Akira
a circle graph. is the answer
Yes you can. First, determine the percentage of the whole is represented by each slice of your circle (or pie) chart. Then make a bar for each slice that is the same percentage of the height of you bar graph. If you graph represents absolute number out of a total, the same principle applies.