单词	Cartesian coordinates
释义	Cartesian coordinates A system used in analytical geometry to locate a point P, with reference to two or three axes (see graphs). In a two-dimensional system the vertical axis is the y-axis and the horizontal axis is the x-axis. The point at which the axes intersect each other is called the origin , O. Values of y 0 fall on the y-axis below the origin, values of x <0 fall on the x-axis to the left of the origin. Any point P is located by its perpendicular distances from the two axes. The distance from the x-axis is called the ordinate ; the distance from the y-axis is the abscissa . The position is indicated numerically by enclosing the values of the abscissa and the ordinate in parentheses and separating the two by means of a comma, e.g. (x,y). In three dimensions the system can be used to locate a point with reference to a third, z-axis. It is named after René Descartes (1596–1650). Cartesian coordinates
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