Everything we have done on the coordinate plane so far has been using rectangular coordinates. That's the x and y we are used to. But that's not the only coordinate system. We can also use polar coordinates, which graph points in terms of a radius, or distance from a pole, and theta, the angle associated with the point. This system is useful for graphing circles and other curved objects, so let's make sure we understand how to use these, as well as convert between polar and rectangular forms.
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