${\displaystyle A}$ — one of two focuses, ${\displaystyle O}$ — center of line between focuses.
${\displaystyle \textstyle BC=CD=OC={\frac {AO}{\sqrt {2}}},\;AB=AO}$.

DescriptioLemniscate Building 2.gif	English: Drawing lemniscate of Bernoulli Русский: Построение лемнискаты Бернулли
Datum	21 Iunius 2010
Fons	Opus proprium
Auctor	Zorgit
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