## Definitions

### from Wiktionary, Creative Commons Attribution/Share-Alike License.

- noun
*geometry*Theirrational number (approximately 1·618), usually denoted by theGreek letter φ (phi ), which is equal thesum of its ownreciprocal and 1, or, equivalently, is such that theratio of 1 to the number is equal to the ratio of its reciprocal to 1.

## Etymologies

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## Examples

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oroboros commented on the word golden ratio

See phi.

February 28, 2007

sionnach commented on the word golden ratio

In mathematics and the arts, two quantities are in the golden ratio if the ratio between the sum of those quantities and the larger one is the same as the ratio between the larger one and the smaller. The golden ratio is approximately 1.6180339887.

phi = 1 + sqrt(5)/2

November 19, 2007