## polar coordinatesr and θ, of a point P in the plane, where r is the point's distance from the origin and θ is an angle measured anticlockwise from some reference line emanating from the origin. Spherical polar coordinates incorporate a second angle, φ, which represents the angle of inclination of a line drawn to the point from a plane surface. A polar
equation is one that uses polar coordinates.## Related category• ANALYTICAL GEOMETRY | ||||||

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