Relative Polar Coordinates

Relative Polar coordinates are measured from some point other than the origin. 

In the diagram below, point 1 is measured from the absolute origin at the large red dot, similar to the Cartesian method.

Now point 2. If the information you have is the distance from point 1 then that distance is known as a relative distance,  measured from point 1. To specify the distance we have to use a temporary coordinate system centred at that point. The green box signifies the temporary coordinate system. Now, in relation to this coordinate system, point 2 is -120degrees and 25units away. We still have to measure the angle from the horizontal, with zero to the right and measure in an anti-clockwise direction.

Exercise 4

Continue with this exercise by entering all of the coordinates for each point relative to the previous point. Don't forget that point 1 is measured from absolute zero so it is an absolute coordinate.
Each of the angles is a multiple of 30 degrees and all distances are 25 units.

Enter your values in the columns headed X and Y. Comments will be placed in the Marked comments column when you click the Click here for marking button.
  Although you have entered the coordinates using a relative method, they are converted to absolute Cartesian Coordinates once the computer program has received them. So, I say yet again, relative methods are only a facility provided by the CAD program in cases where the information you have at hand is more convenient in that form.