
Problem 190.
Tangent circles, Tangent chord, Perpendicular, Diameter, Distance 
In the figure below, AB is the
diameter of circle of center O and radius r. OB is the diameter
of circle of center O'. The chord AD is tangent to circle O' at
E. If DF is perpendicular to AB and BF = x, prove that .
View or post a solution.

Poster and Typography of Problem
190

