autocad

Coordinate system in AUTOCAD using 2 types, namely World Coordinate System (WCS) and the User Coordinate System (UCS). AUTOCAD as used by default is the WCS (World Coordinat System), which is the coordinate system with axes X, Y, Z in which each of the coordinate axes intersect at the point (0,0) or the point of origin, the positive direction of each axis is represented by the direction of the arrow. while UCS is a coordinate system that is devoted to the user and can be changed positions origin point (0,0,0) in accordance with user commands. This system makes the depiction of 3D.
There are several kinds of commands coordinate system AutoCAD 2002 among others,
Cartesian
Cartesian coordinates of the object can be used for two-dimensional (2D) and three dimensional (3D). Based on the Cartesian coordinate axes x, y, z. Is as follows:
(X), (y) and (x), (y), (z)

POLAR
Polar coordinates can only be used on two-dimensional objects. Polar coordinates are used to specify a point by combining distance and angle. Is as follows:
(Distance) <(angle)

RELATIVE
Coordinates are relative to the coordinate system beracuan at the end point of an object that has been created. In the use of relative coordinates assistance @ symbol used is as follows
            @ (X), (y) = for 2D objects and cartesian berkoordinat
            @ (Distance) <(angle) = for 2D objects and patterns berkoordinat