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Definition: The polar coordinates, the radial coordinate, and the angular coordinate are defined in terms of Cartesian coordinates by x = r Cos (o) y = r Sin (o) where is the radial distance from the origin, and is the counterclockwise angle from the x-axis.
Source: Wolfram MathWorld
Example: Graphic example: http://upload.wikimedia.org/wikipedia/commons/ b/b9/Point_in_Polar_coordinates.PNG