# Coxeter- Figure 7.1A

- Author:
- willgiesbarton

- Topic:
- Geometry

Let is the pole of , which meets is the pole of , which meets is the pole of , which meets

*p*and*q*(through*C*) be the polars of two self-conjugate points*P*and*Q*on a line*c*. Let*R*be a point on*p*, distinct from*C*and*P*. Let its polar*r*meet*q*in*S*. Then*r*in*T*. Also*c*in B. Finally,*c*in*A*, the harmonic conjugate of*B*with respect to*P*and*Q*.