14th ibmo - cuba 1999/q2.
Source: Spanish Communities
April 16, 2006
geometry unsolvedgeometry
Problem Statement
Given two circle and , we say that bisects if they intersect in two points and the common chord is a diameter of . Consider two fixed non-concentric circles and .
a) Show that there exists infinitely many circles such that bisects both and .
b) Find the locus of the centres of such circles .