File:Ptolemy Pentagon.svg
From Infogalactic: the planetary knowledge core
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Summary
Application of <a href="https://en.wikipedia.org/wiki/Ptolemy%27s_theorem" class="extiw" title="en:Ptolemy's theorem">Ptolemy's theorem</a> to the quadrilateral made by removing a vertex from a regular pentagon yields b/a = phi, the <a href="https://en.wikipedia.org/wiki/golden_ratio" class="extiw" title="en:golden ratio">golden ratio</a>. This drawing illustrates it.
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File history
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 16:07, 8 January 2017 | | 526 × 526 (10 KB) | 127.0.0.1 (talk) | Application of <a href="https://en.wikipedia.org/wiki/Ptolemy%27s_theorem" class="extiw" title="en:Ptolemy's theorem">Ptolemy's theorem</a> to the quadrilateral made by removing a vertex from a regular pentagon yields b/a = phi, the <a href="https://en.wikipedia.org/wiki/golden_ratio" class="extiw" title="en:golden ratio">golden ratio</a>. This drawing illustrates it. |
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