File:Plastic pentagons alt.svg
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Summary
| Description |
English: Pentagons tiled by whorls of equilateral triangles with sides in plastic ratio ρ, satisfying ρ3 = ρ + 1. The polar slope of the logarithmic spirals is 3/πln(ρ), corresponding to angle 74°58'. Relative to the left-hand base vertex, each pole has Cartesian coordinates (ρ7/2(ρ + 2), √3/2(ρ + 2)). This arrangement was discovered in 1949 by John Rutherford Boyd, searching for spirals which touch multiple times. For a similar figure, see:  |
| Date | |
| Source | Own work |
| Author | Zilverspreeuw |
| SVG development |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 11:57, 7 June 2025 | | 500 × 500 (4 KB) | wikimediacommons>Zilverspreeuw | Uploaded own work with UploadWizard |
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