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Any of a number of co-ordinate systems in which a point is identified by parameters identifiable as a distance from some fixed feature in space and one or more subtended angles.



Sub types include:



<i>Circular Polar Coordinates</i>



A two-dimensional coordinate system in which a point is located by its distance from some predefined point (known as the origin) and the angle made by a line joining from the origin to the point and some fixed axis. The angle is typically denoted &theta; and the distance '<i>r</i>' (for radius).



<i>Cylindrical Polar Coordinates</i>



A three-dimensional system similar to circular polar coordinates except the angle and radius are measured relative to a fixed straight axis in space, and a third co-ordinate is used, which measures the vertical height above some fixed plane normal to this axis.



<i>Spherical Polar Coordinates</i>



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