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In rectangular coordinates, the type most often used, the axes are taken to be perpendicular, with the x -axis horizontal and the y -axis vertical, so that the x -coordinate, or abscissa, of P is measured along the horizontal perpendicular from P to the y -axis (i.e., parallel to the x -axis) and the y -coordinate, or ordinate, is measured along the vertical perpendicular from P to the x -axis (parallel to the y -axis).
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