A Cartesian coordinate system is a coordinate system that specifies each point uniquely in a plane by a pair of numerical coordinates, which are the signed distances from the point to two fixed perpendicular directed lines, measured in the same unit of length. Each reference line is called a coordinate axis or just axis of the system, and the poin...
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http://en.wikipedia.org/wiki/Cartesian_coordinate_system
noun a coordinate system for which the coordinates of a point are its distances from a set perpendicular lines that intersect at the origin of the system
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https://www.encyclo.co.uk/local/20974
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