Cartesian coordinates
An ordered set of real numbers that defines the position of a point in terms of its projection on to mutually perpendicular number lines. In the plane, each point is defined by two such projections, one on to the x-axis and one on to the y-axis, and is written as an ordered pair of real numbers (x, y). The same system works equally in spaces of three or more dimensions.
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• ANALYTICAL GEOMETRY
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