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- I use the trapezoid rule to calculate the area of each ring, and negative area (assuming the first is positive) indicates a hole. And, yes a hole can have a "hole", but it's actually an outer ring that happens to be inside an inner ring (and this ring can have an inner ring, etc).Vince– Vince2014-05-08 03:22:17 +00:00Commented May 8, 2014 at 3:22
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