x² + y² - a x = 0

(x - 5)² + (y - 5)² = 4

a = 1.1 (slider from -4 to 20, step 0.1)
c: x^(2) + y^(2) - (a * x) = 0
d: (x - 5)^(2) + (y - 5)^(2) = 4
K_2, K_1 = Intersect(d, c)
P = Center(c)
A = Center(d)
b = Segment(P, A)