Cartesian Coordinates Rectangular Or Cartesian coordinates of a point: The French Mathematician and Philosopher Rene Descartes first published his book La Geometric in 1637 in which he used algebra in the study of geometry. This he did by representing points in a plane by ordered pairs of real numbers, called Cartesian coordinates (named after Rene Descartes). In this … [Read more...] about Cartesian Coordinates