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If you mean in a 2-dimensional plane, the two ways I know of are Cartesian coordinates and polar coordinates. In the Cartesian coordinate system, there are 2 perpendicular axes, a horizontal and vertical (usually these are label x and y respectively). In this system, position is given by the distance from the origin (the center of the grid where x and y = 0) in the x and y direction. For example, if a point is 3 units away from the origin in the horizontal direction and 1 unit in the vertical the direction, the point is at (3,1) ( the 3 is the x and the 1 is the y). In polar coordinates, the position of a point is given by its distance from the origin (r) and the angle the line r makes with the horizontal axis. This angle is positive in the counterclockwise direction from the right side horizontal axis.

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15y ago

What else can I help you with?