Y by
Two circles
and
with equal radii intersect at P and Q. Points B and C are located on the circles
and
so that they are inside the circles
and
, respectively. Also, points X and Y distinct from P are located on
and
, respectively, so that:
The intersection point of the circumcircles of triangles XPC and YPB is called S. Prove that BC, XY and QS are concurrent.
Thanks.









Thanks.