polar coordinates

plural noun

1. See spherical coordinates, Cartesian coordinates
   a pair of coordinates for locating a point in a plane by means of the length of a radius vector, r, which pivots about the origin to establish the angle, θ, that the position of the point makes with a fixed line. Usually written ( r , θ) See also Cartesian coordinates spherical coordinates

Example Sentences

In the geometry of motion under central forces the advantage of working with polar coordinates is great.

From Project Gutenberg