سیستمی پۆتانی جەمسەری

${\displaystyle x=r\cos \theta \,}$ 
${\displaystyle y=r\sin \theta ,\,}$ 

${\displaystyle r^{2}=y^{2}+x^{2}\,}$  (ڕێسای پیتاگۆرس)

${\displaystyle \theta ={\begin{cases}\arctan({\frac {y}{x}})&{\mbox{if }}x>0\\\arctan({\frac {y}{x}})+\pi &{\mbox{if }}x<0{\mbox{ and }}y\geq 0\\\arctan({\frac {y}{x}})-\pi &{\mbox{if }}x<0{\mbox{ and }}y<0\\{\frac {\pi }{2}}&{\mbox{if }}x=0{\mbox{ and }}y>0\\-{\frac {\pi }{2}}&{\mbox{if }}x=0{\mbox{ and }}y<0\end{cases}}}$ 

${\displaystyle z=r\cdot (cos\theta +isin\theta )\!}$ 

${\displaystyle z=re^{i\theta }\,}$ 

${\displaystyle L=\int _{\beta }^{\alpha }{\sqrt {\left({\frac {dr}{d\theta }}\right)^{2}+r^{2}}}d\theta }$