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The golden ratio is a number, commonly known as phi, defined as 'phi * phi = phi - 1.' In decimal form it is written 1.618... It has been observed that the golden ration is evident in the arrangement of branches along the stems of plants, and of veins in leaves.
The golden ratio is a number, commonly known as phi, defined as 'phi * phi = phi - 1.' The value of phi is
:<math>\frac{1 + \sqrt{5}}{2}</math>
Phi is an [[irrational number]]. In decimal form it is often written
:1.618...
It has been observed that the golden ration is evident in the arrangement of branches along the stems of plants, and of veins in leaves.