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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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Q: How do you make a circle graph?
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