"Cartesian plane." YourDictionary, n.d. Web. 22 June 2018. <http://www.yourdictionary.com/cartesian-plane>.
Cartesian plane. (n.d.). Retrieved June 22nd, 2018, from http://www.yourdictionary.com/cartesian-plane
From the name of the French mathematician and philosopher RenÃ© Descartes who is credited with developing the mathematics.
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