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Editorial Team
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Editorial Team
Asked: May 25, 20262026-05-25T13:00:34+00:00 2026-05-25T13:00:34+00:00

Given sets of 2D points which are the boundaries of an irregular shape, a

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Given sets of 2D points which are the boundaries of an irregular shape, a shape which may not be convex and may have internal holes, is there an algorithm to find the largest circle that fits within the boundaries?

I’ve done a good bit of searching, and I do find algorithms that are close, such as the largest empty circle problem, but none that I have found so far match the constraints I have.

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  1. Editorial Team
    Editorial Team
    2026-05-25T13:00:35+00:00Added an answer on May 25, 2026 at 1:00 pm

    Problem is not good defined since set of points don’t bound any area. Boundary you mention should be some curve, probably polygon. Without that you can’t say that there are internal holes, and also can’t ask for circle to be within boundary. With this definition, you can create circle of any size on “outside” that touches few set points.

    If you use polygon to specify boundary, Aioobe’s link is good one. If you redefine problem to find maximal radius circle touching at least 3 points of given set, than it is same as checking for circumcircles of Dalaunay triangulation.

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