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P82 · Packing and covering · Classic · Hard

Equal circles in regular polygons · m = 6 · n = 22

Pack n equal circles into the true regular m-gon with centre (1,1), circumradius 1 and first vertex (2,1), maximising their radius.

Instancem = 6 · n = 22
ObjectiveMaximize circle radius
Best known, unproven0.168017815756Source-precision interval: 0.168017815755–0.168017815757 (values inside match)exhibited site certificate 0.168017815Packomania (compiled by Eckard Specht), m=6, n=22. Eckard Specht, program chx , 2020. Coordinates imported from the public archive, normalized, decimalized and exactly verified by MinMax Arena. The web-table target and grid certificate are separate.

Formal definition

  • ContainerThe editor and certificate normalize to the true regular m-gon with centre (1,1), circumradius 1 and first vertex (2,1). This is a coordinate convention only; scores use the literature's unit-piece scale. Boundary contact is allowed.
  • SubmissionSubmit {radius, placements:[{x,y,turn},…]}, with decimal strings of at most nine places. x,y are centres; circles require turn=0, polygons use turn=tan(θ/2). Coordinates and turn lie in ±4; 0 < radius ≤ 4.
  • ConstraintsExactly n congruent shapes lie wholly in the container with pairwise disjoint interiors. Polygon rotations are independent, not limited to quarter turns.
  • PrecisionInput decimals are exact rationals; regular-polygon vertices are algebraic, not rounded templates. Feasibility has no floating-point tolerance. A finite-decimal certificate is not a continuous optimality proof.
  • ObjectiveCircle radius r, larger is better; the container circumradius is 1.
Open the full editor ↗
VERIFIED CONSTRUCTIONVERIFIED CONSTRUCTION

Getting a feel for it

Source and certificate

External targets are converted with their printed precision; decimal coordinate certificates are separate. Reconstruction loss never lowers the literature target, and a source construction is not automatically an optimality proof.

Source
The record-holding arrangement for Equal circles in regular polygons m = 6 · n = 22, 0.168017815
Current leader

0.168017815

circle radius

Answer sourceEckard Specht
Solution methodPublished reference construction
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Record holder's solver noteNo solver note yet (expand)＋

The record holder has not shared a solver note yet.

ANSWER FORMAT

How to write your answer

the true regular m-gon with centre (1,1), circumradius 1 and first vertex (2,1)

Submit {radius, placements:[{x,y,turn},…]}, with decimal strings of at most nine places. x,y are centres; circles require turn=0, polygons use turn=tan(θ/2). Coordinates and turn lie in ±4; 0 < radius ≤ 4.

The current leader's answer

{
  "placements": [
    {
      "turn": "0",
      "x": "0.845433476",
      "y": "0.301992412"
    },
    {
      "turn": "0",
      "x": "1.181469108",
      "y": "0.301992412"
    },
    {
      "turn": "0",
      "x": "0.530045894",
      "y": "0.417969213"
    },
    {
      "turn": "0",
      "x": "1.485557891",
      "y": "0.444995761"
    },
    {
      "turn": "0",
      "x": "1.013451292",
      "y": "0.593007805"
    },
    {
      "turn": "0",
      "x": "0.362028078",
      "y": "0.708984607"
    },
    {
      "turn": "0",
      "x": "0.698063710",
      "y": "0.708984607"
    },
    {
      "turn": "0",
      "x": "1.317540075",
      "y": "0.736011154"
    },
    {
      "turn": "0",
      "x": "1.653575707",
      "y": "0.736011154"
    },
    {
      "turn": "0",
      "x": "0.194010262",
      "y": "1.000000000"
    },
    {
      "turn": "0",
      "x": "0.530045894",
      "y": "1.000000000"
    },
    {
      "turn": "0",
      "x": "0.866081525",
      "y": "1.000000000"
    },
    {
      "turn": "0",
      "x": "1.778237825",
      "y": "1.048067723"
    },
    {
      "turn": "0",
      "x": "1.198346754",
      "y": "1.050197242"
    },
    {
      "turn": "0",
      "x": "1.488916036",
      "y": "1.218985388"
    },
    {
      "turn": "0",
      "x": "0.362028078",
      "y": "1.291015393"
    },
    {
      "turn": "0",
      "x": "0.724919871",
      "y": "1.307135672"
    },
    {
      "turn": "0",
      "x": "1.053144069",
      "y": "1.386026264"
    },
    {
      "turn": "0",
      "x": "1.485557891",
      "y": "1.555004239"
    },
    {
      "turn": "0",
      "x": "0.530045894",
      "y": "1.582030787"
    },
    {
      "turn": "0",
      "x": "0.845433476",
      "y": "1.698007588"
    },
    {
      "turn": "0",
      "x": "1.181469108",
      "y": "1.698007588"
    }
  ],
  "radius": "0.168017815"
}
Submission format and technical detailsOpen this when you are ready to prepare a JSON answer＋

Instance parameters

{
  "n": 22,
  "sides": 6
}

The current leader's answer

{
  "placements": [
    {
      "turn": "0",
      "x": "0.845433476",
      "y": "0.301992412"
    },
    {
      "turn": "0",
      "x": "1.181469108",
      "y": "0.301992412"
    },
    {
      "turn": "0",
      "x": "0.530045894",
      "y": "0.417969213"
    },
    {
      "turn": "0",
      "x": "1.485557891",
      "y": "0.444995761"
    },
    {
      "turn": "0",
      "x": "1.013451292",
      "y": "0.593007805"
    },
    {
      "turn": "0",
      "x": "0.362028078",
      "y": "0.708984607"
    },
    {
      "turn": "0",
      "x": "0.698063710",
      "y": "0.708984607"
    },
    {
      "turn": "0",
      "x": "1.317540075",
      "y": "0.736011154"
    },
    {
      "turn": "0",
      "x": "1.653575707",
      "y": "0.736011154"
    },
    {
      "turn": "0",
      "x": "0.194010262",
      "y": "1.000000000"
    },
    {
      "turn": "0",
      "x": "0.530045894",
      "y": "1.000000000"
    },
    {
      "turn": "0",
      "x": "0.866081525",
      "y": "1.000000000"
    },
    {
      "turn": "0",
      "x": "1.778237825",
      "y": "1.048067723"
    },
    {
      "turn": "0",
      "x": "1.198346754",
      "y": "1.050197242"
    },
    {
      "turn": "0",
      "x": "1.488916036",
      "y": "1.218985388"
    },
    {
      "turn": "0",
      "x": "0.362028078",
      "y": "1.291015393"
    },
    {
      "turn": "0",
      "x": "0.724919871",
      "y": "1.307135672"
    },
    {
      "turn": "0",
      "x": "1.053144069",
      "y": "1.386026264"
    },
    {
      "turn": "0",
      "x": "1.485557891",
      "y": "1.555004239"
    },
    {
      "turn": "0",
      "x": "0.530045894",
      "y": "1.582030787"
    },
    {
      "turn": "0",
      "x": "0.845433476",
      "y": "1.698007588"
    },
    {
      "turn": "0",
      "x": "1.181469108",
      "y": "1.698007588"
    }
  ],
  "radius": "0.168017815"
}

Submit {radius, placements:[{x,y,turn},…]}, with decimal strings of at most nine places. x,y are centres; circles require turn=0, polygons use turn=tan(θ/2). Coordinates and turn lie in ±4; 0 < radius ≤ 4. · Verifier v1.0.0

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