Definition of rectangular coordinate
: a Cartesian coordinate of a Cartesian coordinate system whose straight-line axes or coordinate planes are perpendicular
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“Rectangular coordinate.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/rectangular%20coordinate. Accessed 14 Jun. 2021.
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The first known use of rectangular coordinate was in 1805
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