File:Ptolemy Pentagon.svg

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Summary

English: 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.

Uploaded by en:User:Dicklyon to en.wikipedia in August 2006 ( log).

This work has been released into the public domain by its author, Dicklyon at the English Wikipedia project. This applies worldwide.

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The following pages on Schools Wikipedia link to this image (list may be incomplete):

Golden ratio

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