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P86 · Packing and covering · Classic · Hard

Regular pentagons in a square · n = 18

Pack n unit-side regular pentagons into a square. Contact is allowed; interiors cannot overlap. Minimise the container square side.

Instancen = 18
ObjectiveMinimize container square side

Record comparison

container square side · Lower is better
RecordValue / intervalAuthor / holderSource
External best known[6.32565, 6.32566)Bhavithran AnanthanErich Friedman ↗
Site recordNo player record yet——

Formal definition

  • ContainerThe editor and certificate normalise the container to the unit square [0,1]², while public scores are reported in the literature's unit-piece scale. Boundary contact is allowed.
  • SubmissionSubmit {radius, placements:[{x,y,turn},…]}, with each value written as a decimal string of at most nine places. Here x, y are centre coordinates; circles require turn = 0 and polygons use turn = tan(θ/2). Coordinates and turn must lie in [−4, 4], with 0 < radius ≤ 4.
  • ConstraintsExactly n congruent pieces lie wholly inside the container with pairwise disjoint interiors. Polygons may rotate independently by arbitrary angles.
  • PrecisionInput decimals are parsed as exact rationals and regular-polygon vertices are defined algebraically, with zero floating-point tolerance in feasibility checks.
  • ObjectiveContainer square side = 1/(2 sin(π/5) r), where smaller is better. Pages, leaderboards, and literature records share this unit with automatic conversion.
Open full editor ↗

Layout shown: starter layout

VERIFIED CONSTRUCTIONVERIFIED CONSTRUCTION

Getting a feel for it

Literature targets and coordinate certificates

Literature targets are converted at their published precision, while nine-decimal coordinate certificates are stored and displayed alongside the source values.

Source
The current arrangement for Regular pentagons in a square n = 18
LAYOUT & HISTORY

Starter layout

Inspect the layout, solver notes and record history.

Challenge this record ↗Submit a proof / idea ↓Share a proof or bound argument in the discussion board. Accepted contributions earn proof points.
ANSWER FORMAT

How to write your answer

the unit square [0,1]²

Submit {radius, placements:[{x,y,turn},…]}, with each value written as a decimal string of at most nine places. Here x, y are centre coordinates; circles require turn = 0 and polygons use turn = tan(θ/2). Coordinates and turn must lie in [−4, 4], with 0 < radius ≤ 4.

Starter answer

{
  "placements": [
    {
      "turn": "0.000000000",
      "x": "0.108793593",
      "y": "0.872105461"
    },
    {
      "turn": "-0.158384440",
      "x": "0.372105461",
      "y": "0.891206407"
    },
    {
      "turn": "-0.158384440",
      "x": "0.627894539",
      "y": "0.891206407"
    },
    {
      "turn": "0.324919696",
      "x": "0.891206407",
      "y": "0.872105461"
    },
    {
      "turn": "0.158384440",
      "x": "0.500000000",
      "y": "0.715174677"
    },
    {
      "turn": "0.324919696",
      "x": "0.245758583",
      "y": "0.690440168"
    },
    {
      "turn": "-0.000000000",
      "x": "0.754241417",
      "y": "0.690440168"
    },
    {
      "turn": "0.324007017",
      "x": "0.890905846",
      "y": "0.508091727"
    },
    {
      "turn": "0.000000000",
      "x": "0.363770934",
      "y": "0.500000000"
    },
    {
      "turn": "-0.324919696",
      "x": "0.636229066",
      "y": "0.500000000"
    },
    {
      "turn": "-0.000094526",
      "x": "0.110339679",
      "y": "0.494748040"
    },
    {
      "turn": "0.324919696",
      "x": "0.245758583",
      "y": "0.309559832"
    },
    {
      "turn": "-0.000000000",
      "x": "0.754241417",
      "y": "0.309559832"
    },
    {
      "turn": "-0.158384440",
      "x": "0.500000000",
      "y": "0.284825323"
    },
    {
      "turn": "0.000000000",
      "x": "0.108793593",
      "y": "0.127894539"
    },
    {
      "turn": "0.324919696",
      "x": "0.891206407",
      "y": "0.127894539"
    },
    {
      "turn": "0.158384440",
      "x": "0.372105461",
      "y": "0.108793593"
    },
    {
      "turn": "0.158384440",
      "x": "0.627894539",
      "y": "0.108793593"
    }
  ],
  "radius": "0.134476275"
}
Submission format and technical detailsOpen this when you are ready to prepare a JSON answer＋

Instance parameters

{
  "n": 18,
  "sides": 5
}

Starter answer

{
  "placements": [
    {
      "turn": "0.000000000",
      "x": "0.108793593",
      "y": "0.872105461"
    },
    {
      "turn": "-0.158384440",
      "x": "0.372105461",
      "y": "0.891206407"
    },
    {
      "turn": "-0.158384440",
      "x": "0.627894539",
      "y": "0.891206407"
    },
    {
      "turn": "0.324919696",
      "x": "0.891206407",
      "y": "0.872105461"
    },
    {
      "turn": "0.158384440",
      "x": "0.500000000",
      "y": "0.715174677"
    },
    {
      "turn": "0.324919696",
      "x": "0.245758583",
      "y": "0.690440168"
    },
    {
      "turn": "-0.000000000",
      "x": "0.754241417",
      "y": "0.690440168"
    },
    {
      "turn": "0.324007017",
      "x": "0.890905846",
      "y": "0.508091727"
    },
    {
      "turn": "0.000000000",
      "x": "0.363770934",
      "y": "0.500000000"
    },
    {
      "turn": "-0.324919696",
      "x": "0.636229066",
      "y": "0.500000000"
    },
    {
      "turn": "-0.000094526",
      "x": "0.110339679",
      "y": "0.494748040"
    },
    {
      "turn": "0.324919696",
      "x": "0.245758583",
      "y": "0.309559832"
    },
    {
      "turn": "-0.000000000",
      "x": "0.754241417",
      "y": "0.309559832"
    },
    {
      "turn": "-0.158384440",
      "x": "0.500000000",
      "y": "0.284825323"
    },
    {
      "turn": "0.000000000",
      "x": "0.108793593",
      "y": "0.127894539"
    },
    {
      "turn": "0.324919696",
      "x": "0.891206407",
      "y": "0.127894539"
    },
    {
      "turn": "0.158384440",
      "x": "0.372105461",
      "y": "0.108793593"
    },
    {
      "turn": "0.158384440",
      "x": "0.627894539",
      "y": "0.108793593"
    }
  ],
  "radius": "0.134476275"
}

Submit {radius, placements:[{x,y,turn},…]}, with each value written as a decimal string of at most nine places. Here x, y are centre coordinates; circles require turn = 0 and polygons use turn = tan(θ/2). Coordinates and turn must lie in [−4, 4], with 0 < radius ≤ 4. · Verifier v1.0.0

DISCUSSION

Discussion

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外部记录更新NUE_13#311 replies