r_1 = 2.1 (slider from 0 to 5, step 0.1)
C_1 = (1, 0)
P = (1.44, 0.91)
C_f = (0, 0)
a = Ray(C_f, P)
c = Circle(C_1, r_1)
P_1 = Intersect(c, a)
b = Segment(P_1, C_1)
d = Line(P, b)
C = Intersect(d, xAxis)