golden ratio

World English Dictionary
golden ratio
 
n
Compare golden section Φ 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)

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Golden ratio is always a great word to know.
So is quincunx. Does it mean:
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
Dictionary.com's 21st Century Lexicon
Main Entry:  golden ratio
Part of Speech:  n
Definition:  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
Example:  The golden ratio is used to give proportions of height to width when laying out text and illustrations.
Main Entry:  golden ratio
Part of Speech:  n
Definition:  See golden ratio
Dictionary.com's 21st Century Lexicon
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