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What are the proper terms for these concepts?

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From	Daniel Pitts <newsgroup.nospam@virtualinfinity.net>
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I have a few concepts in a program I'm writing, but I'm not sure if 
there are "canonical" terms for them, and would like to use those terms 
if possible.  All these terms are for 2 dimensional shapes, but if there 
is a more general term for n dimensional I'd be interested in that as 
well, just for knowledge sake.

In my codebase, it makes sense to distinguish between an absolute angle 
and a relative angle. Absolute angles are really relative to the fixed 
"east" vector, and Relative angles are clockwise or counter-clockwise 
rotations. You can scale relative angles, but not absolute angles. You 
can add relative angles to each other or to absolute angles, but 
absolute angles can't be added to each other.  You can find a relative 
angle between two absolute angles. Is there a more formal concept of this?

One thing I'm calling an "angle bracket", which is basically two angles, 
the absolute angle "clockwise-bound" and the relative angle "width". 
This can include a zero width bracket (basically just a ray), or an all 
inclusive bracket.

If I add a radius to that (to make it a pie slice), the term I found is 
"sector". Is a full circle also a "sector"? How about if the angle is zero?

Thanks in advance,
Daniel.

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What are the proper terms for these concepts? Daniel Pitts <newsgroup.nospam@virtualinfinity.net> - 2012-03-13 10:21 -0700
  Re: What are the proper terms for these concepts? Lew <lewbloch@gmail.com> - 2012-03-13 11:25 -0700
    Re: What are the proper terms for these concepts? Daniel Pitts <newsgroup.nospam@virtualinfinity.net> - 2012-03-13 13:35 -0700
      Re: What are the proper terms for these concepts? Lew <lewbloch@gmail.com> - 2012-03-13 13:57 -0700
        Re: What are the proper terms for these concepts? Daniel Pitts <newsgroup.nospam@virtualinfinity.net> - 2012-03-14 09:07 -0700
      Re: What are the proper terms for these concepts? "John B. Matthews" <nospam@nospam.invalid> - 2012-03-13 23:17 -0400
        Re: What are the proper terms for these concepts? Daniel Pitts <newsgroup.nospam@virtualinfinity.net> - 2012-03-14 09:02 -0700
  Re: What are the proper terms for these concepts? Lew <lewbloch@gmail.com> - 2012-03-13 11:29 -0700
  Re: What are the proper terms for these concepts? "Alex" <alex@foo.invalid> - 2012-03-13 21:49 +0000
  Re: What are the proper terms for these concepts? Roedy Green <see_website@mindprod.com.invalid> - 2012-03-14 15:30 -0700
    Re: What are the proper terms for these concepts? Martin Gregorie <martin@address-in-sig.invalid> - 2012-03-15 01:09 +0000
      Re: What are the proper terms for these concepts? Lew <lewbloch@gmail.com> - 2012-03-14 18:24 -0700
        Re: What are the proper terms for these concepts? Martin Gregorie <martin@address-in-sig.invalid> - 2012-03-15 22:05 +0000

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