Lesson17- Relative Polar Coordinates

The @X,Y format for entering relative coordinates is also referred to as cartesian relative coordinates.

  • when drawings involve angles other than multiples of 90 degrees it can be awkward to work with cartesian coordinates.

Sometimes it is easier to work with relative coordinates that use distances and angles instead of X and Y ordinates.

  • these are called relative polar coordinates and you enter them on the command line when prompted for points by typing @R<A.
  • @R<A can be interpreted as “from where I am now move a distance of R at an angle of A ”.

Practice with relative polar coordinates

  1. Close the drawing from the previous exercise if it is open.
  2. Pick File + New and pick the Start from Scratch button. Select English as the Default Settings & pick OK.

You will create the outline shape illustrated below by using the Line command with relative polar coordinates this time.

  • you will begin and end the sequence of LINE objects on P1 which is at the coordinates of ( 3,3 )

3- Pick Draw + Line and follow the dialogue below to create the outline shape shown above using relative polar coordinates for all points except the starting point. When you return to P1 you can press <enter> to complete Line.

Command: _line
Specify first point: 3,3

Specify next point or [Undo]: @2<0
Specify next point or [Undo]: @2<300
Specify next point or [Close/Undo]: @2<60
Specify next point or [Close/Undo]: @2<0

(complete the outline shape on your own)

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