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When a command prompts for specifying a point, It is possible to use the pointing device to specify a point, or to enter a coordinate value on the command line. You can enter two-dimensional coordinates as either Cartesian (X,Y)or polar coordinates.
A Cartesian coordinate system has two axes X, and Y.When entering coordinate values, one indicates a point's distance (in units) and its direction (+ or -) along the X, and Y axes relative to the coordinate system origin (0,0).
In 2D, you specify points on the XY plane, also called the construction plane; it is similar to a flat sheet of grid paper. The X value of a Cartesian coordinate specifies the horizontal distance, while the Y value specifies the vertical distance. The point of origin (0,0) indicates where the two axes intersect.
Polar coordinates systems use a distance and an angle to locate a point. With both Cartesian and polar coordinates, it is possible to enter absolute coordinates based on the origin (0,0), or relative coordinates based on the last specified point.
Another way of entering a relative coordinate is by moving the cursor to specify a direction and then entering a distance directly. This method is called direct distance entry.
The current cursor location is displayed as a coordinate value on the status bar.
The status bar is also displaying the horizontal (dx), vertical (dy) and Cartesian (d) distances of the cursor's current position in relation to the last specified point (relative coordinates).
Coordinates display characteristics:
