B Figure 1: Problem 7.1.13 1) In figure 1, the circle has the equation (x - 1 ) 2 + y = 1, with P=(0,0), Q=(1,0), and R=(a,0) where 0 < a < 1 and a # 1/2. Find the coordinates of S, where lines SA and SB are tangents to the c and A and B have a for their x-coordinate.