Ciorcal

1. Cairtéiseach

${\displaystyle x^{2}+y^{2}=r^{2}\!\ }$

2. Pólar

${\displaystyle x=r\,\cos t,\,}$

${\displaystyle y=r\,\sin t\,}$

3. Coimpléascach

${\displaystyle z=\cos \phi +i\sin \phi \!\ =e^{i\phi }}$

Ní mór dúinn a rá go bhfuil

${\displaystyle z=\cos \pi +i\sin \pi \!\ =e^{i\pi }}$

${\displaystyle z=-1+0=e^{i\pi }}$

${\displaystyle e^{i\pi }+1=0}$

Ciorcal

Féach ar leathanach "Euler's formula" [3] as Béarla.

Cad é ga?

Cad é limistéar?

${\displaystyle \ L=\pi r^{2}=\pi d^{2}/4}$

Cad é stua cruinn?

Stua S

Cad é tadhlaí?

Cad é teascán?

Bíonn méid gach teascóige i gcomhréir le méid na huillinne gafa inti.