Question

The figure below shows a xed circle C1 with equation (x + 1)^2 + y^2 = 1 and a shrinking circle C2 with
radius r and center at the origin. P is the point (0; r), Q is the upper point of intersection of the two
circles, and R is the point of intersection of the line PQ and the x-axis. What happens to R as C2
shrinks? That is, lim R(x) when x-> 0+
This problem is in the book Calculus 1 (James Stewart)