Coordinate system in AutoCAD. AutoCAD Coordinate Absolute, Relative & Polar Coordinate

 There are three types of coordinate systems in AutoCAD.

1. Absolute coordinate
2. Relative coordinate
3. Polar coordinate

 Absolute coordinate:- 

     In this coordinate system always count the number from the origin. When we draw lines, first we have to specify the origin point:

       Before drawing in Absolute, you need to off Dynamic Input

       Coordinate:-  specify 0,0 origin  (100,0), (100,50), (0,50), (0,0) to close the object 

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1. Type L for the command line and press Enter
2. Type any point like (15,0) it means we 15 in +x direction from origin and 0 in the y-direction 
3. When we take one direction 0  like (15,0) then the line draws in straight and perpendicular to the axis line.
4. When we draw the line straight but not perpendicular to the axis then you need to specify both directions like (4,6) both directions should not be zero 0. 
5. Again press Enter to finish the command or click Esc.

 We just give a command to AutoCAD to draw a line starting at (4,6) and ending at (15,0). It made a line segment between those two points. The first point is 4 to the right (+x axis) and 6 up (+y axis) from the origin and both intersect at points (4,6). The second point is 15 to the right (+x axis) and 0 at the origin then point (15,0)

Relative coordinate:-

 In a relative coordinate system, AutoCAD does not count from 0,0. The previous specific point is a reference point in the drawing. But you need to add @ before point (x,y) this specifies that the relative coordinate

Relative Coordinate :- 0,0 origin Start   @(100,0), @(0,50), @(-100,0), @(0,-50)

1. L enter for command line 
2. first, specify the origin point 0,0 or required value
3. Type  @6,3 on the command line 
4. Enter to finish the line command
5. If you want to draw a line straight and perpendicular to the axis then you need to specify one direction 0 like  @5,0 and @0,4 if you draw a line on the x-axis then the y-axis is 0 and when we draw a line on the y-axis then the x-axis 0.

Polar coordinate:-

    Polar coordinates are used when you need to draw the next points at a specific angle. The polar coordinates system in AutoCAD specifies the distance length at which angle. Using polar coordinate points entered by typing @distance<angle Enter.

 

   Polar Coordinate:- specify 0,0 origin    @100<0°, @70<90°, @100<180°, @70<270°

Relative coordinates also work with polar input. Turn on polar tracking (F10) to track the angle by moving the mouse and the specified angle selected. The user can specify the acceptable angle increments by right-clicking the icon.

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