Ẓeṛ aɣbalu n Amḍan n wuṛeɣ


[[Tugna:Golden_ratio_line2.svg|vignette|assaɣ a/b yegda-d amḍan n wuṛeɣ <math>\varphi</math> (phi)]]
<big>Amḍan n wuṛeɣ d taẓunt, tettwasbadu s tanzeggit, am wassaɣ awḥid a/b i yellan gar sin n teɣziwin  a akked b  am akken assaɣ n timernit a + b ɣef tinna meqqren akk (a) atili tegda ar tinna meqqren (a) ɣef tinna mecṭuḥen (b), yettwaru s tenfalit agi :</big> 

<big><math>\frac{a+b}a=\frac ab</math> akked <math>\frac ab = \varphi</math></big>

<big><br />Amḍan armeɣẓan-agi d tifrat tawḥidt yufraren ar tugda <math>\varphi ^ 2 = \varphi + 1 </math>, yegda-d : <math>\varphi=\frac{1+\sqrt5}2\approx1{,}6180339887.</math></big>
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