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The Golden Ratio is (sqrt(5)+1)/2, often denoted φ (phi), or about 1.618033988749894848204586834365638117720...

Golden Ratio

Internet references

Mathworld -- Golden Ratio

Related pages in this website

Fibonacci Numbers -- whose successive ratios approach the Golden Ratio

Recurrence Cycle -- A "Golden" Recurrence Relation -- un+2 = 1/(un un+1φ) has a period of 5.

Trig functions of Special Angles -- The golden ratio pops up here, too.

The webmaster and author of this Math Help site is Graeme McRae.