G Code questions

I need to cut and arc of about 55 degrees with 4 or 6 passes of .003 each.
There are six of these arcs per part, so 36 passes.

Is there a repetitive cycle that will do arcs?

If not, I think it would be possible to redo the same arc 6 times, but
decrease the tool radius compensation by .003 to get the desired result. Is
there any way to do this with sub-programs and counters rather than writing
the same code 36 times?

Can I program using start angle, end angle, radius and center point (0,0)
rather than end points? I have the angles but not the positions and I want
to fool with the angles. It would be a lot more complicated for me to use
end points because of all the extra calculations.

And last, but not least, is this the proper forum for these questions, or
is there another list I should belong to?

Thanks.

Ethan