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Date: Thu, 11 Oct 2012 14:38:19 -0400
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From: DJ Delorie <dj AT delorie DOT com>
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	on Thu, 11 Oct 2012 20:26:51 +0200)
Subject: Re: [geda-user] Flex?
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IIRC, it was something like this:

The arc thickness is the same as the trace thickness.  It starts with
the outside arc, and if it thinks there will be a "hole" left over,
adds more.

The math for the outside arc was done with paper and pencil first,
using circles and triangles to picture everything.