### 26.16.6 Polar reciprocal

The reciprocation command finds poles and polars.

- reciprocation takes two arguments:
  - C, a circle.
  - L, a list of points and lines.
- reciprocation(C,L) returns the list formed by replaced each point or line in L by its polar or pole with respect to the circle C.

#### Example

C:=circle(0,1); P:=point((1+i)/2); L:=line(1,-1+i); RP,RL:=op(reciprocation(C,[P,L]))