The coordinate plane in 2-dimensional space has one point which is the origin. This point is usually denoted by the letter O and has coordinates (0, 0). There are usually two mutually perpendicular axes - one horizontal and one vertical. The first coordinate of any point is the distance of the point, in the horizontal direction, from the vertical axis. The second is its distance, in the vertical direction, from the horizontal axis.
In space with 3 or more dimensions the coordinates are defined in an analogous manner.
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coordinates
Each point in 1-dimensional or 2-d or 3-d or n-d space has a set of 1, 2, 3 or n coordinates and these, TOGETHER, identify the location of the point.
On or below the horizontal axis.
The coordinates of a point are in reference to the origin, the point with coordinates (0,0). The existence (or otherwise) of an angle are irrelevant.
Point A has coordinates (x,y). Point B (Point A rotated 270°) has coordinates (y,-x). Point C (horizontal image of Point B) has coordinates (-y,-x).