Golden ratio (Φ)

Golden ratio, divine proportion, Fi number (Φ)

The parts of a segment divided in golden proportion are to each other, as is the longer part to the entire length.

a / b = (a + b) / a = Φ = 1.6180339887498948482045868343656 …

It often occurs in nature and is associated, for example, in physics with the lowest energy.

See the Fibonacci Sequence

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The golden ratio appears very often on this website …