![cover image](https://wikiwandv2-19431.kxcdn.com/_next/image?url=https://upload.wikimedia.org/wikipedia/commons/thumb/e/ed/Pole_and_polar.svg/640px-Pole_and_polar.svg.png&w=640&q=50)
Pole and polar
Unique point and line of a conic section / From Wikipedia, the free encyclopedia
"Polar line" redirects here. For the railway line, see Polar Line.
In geometry, a pole and polar are respectively a point and a line that have a unique reciprocal relationship with respect to a given conic section.
![Thumb image](http://upload.wikimedia.org/wikipedia/commons/thumb/e/ed/Pole_and_polar.svg/220px-Pole_and_polar.svg.png)
Polar reciprocation in a given circle is the transformation of each point in the plane into its polar line and each line in the plane into its pole.