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H3 pentagons
Global12 pentagon cells per resolution sit at icosahedron vertices; they break the 6-neighbour and regular-shape assumptions and have lower inscribed/circumscribed ratios.
Detection
isPentagon(cell).
Mitigation
- Handle pentagons explicitly
- Do not assume a hexagon inscribed ratio of cos(30°)
- Report per-cell shape regularity
Affected conversions
- H3inscribed circle
- H3circumscribed circle
- H3exact polygon