coordinates

A sytem of numbers used to locate a point or object in a drawing.
In the Cartesian coordinate system 2 numbers x and y are used to describe the location of a point in the horizontal and vertical dimensions respectively. 3D CAD programs add the z coordinate which describes distance in the third dimension.
In the Polar coordinate system a point is described by a distance and an angle where 0° exends horizontally to the right.

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