Image:Ptolemy Pentagon.svg

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Ptolemy_Pentagon.svg‎ (SVG file, nominally 526 × 526 pixels, file size: 10 KB)

Summary

Application of Ptolemy's theorem to the quadrilateral made by removing a vertex from a regular pentagon yields b/a = phi, the golden ratio. This drawing illustrates it.

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File history

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Date/Time Dimensions User Comment
current 00:31, 29 August 2006 526×526 (10 KB) Dicklyon ( Talk | contribs) (Application of Ptolemy's theorem to the quadrilateral made by removing a vertex from a regular pentagon yields b/a = phi, the golden ratio. This drawing illustrates it.)
revert 00:26, 29 August 2006 744×1,052 (10 KB) Dicklyon ( Talk | contribs) (Application of Ptolemy's theorem to the quadrilateral made by removing a vertex from a regular pentagon yields b/a = phi, the golden ratio. This drawing illustrates it.)

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