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golden ratio

noun
1.
the ratio of two lengths, equal in value to (1 + √5)/2, and given by b/a = (b + a)/b; it is the reciprocal of the golden section and also equal to (1 + golden section) Φ Compare golden section
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
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Contemporary definitions for golden ratio
noun

the value (1 + sqrt(5)) / 2, which is approximately 1.6180339887, the ratio of a diagonal of a pentagon to its side; also called golden ratio , golden section , golden number , divine proportion

Examples

The golden ratio is used to give proportions of height to width when laying out text and illustrations.

noun

See golden ratio

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