Let us recall that we did set up a random triangle { Triangle A-B-C } previously in Part IV :

In this Part V of the paper , we shall introduce two (2) different Reference Frames ,
- each using the { centroid of Triangle A-B-C } as the [ Point of Origin ] .

The { OLD Reference System } , as per the diagram on-the-left above ,
- shall be the same Reference System we have used in Part IV ;
where as :
- the { NEW Reference System } , as per the diagram on-the-right above ,
- is simply { OLD Reference System } rotated clockwise thru the random angle { Delta } .