Ration auree

Le ration auree es un del constantes fundamental del Mathematica, representate per le littera grec "phi" (φ), e illo ha le valor approximate de 1,6180339887498948482045868343656...

  +---------+-----+
  A         D     B

$\frac{AB}{AD}=\frac{AD}{DB}=\varphi =\frac{1+\sqrt{5}}{2}$