I was looking at the equation of a circle in polar coordinates on wikipedia,(adsbygoogle = window.adsbygoogle || []).push({});

http://en.wikipedia.org/wiki/Polar_coordinate_system

and I understand that a is the radius of the circle, and that (r0, phi) is the center of the circle. But I don't see what the r and theta refer to :(.

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# Homework Help: Equation of a circle / polar coordinates

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