A = (0.98, 0.76)
B = (5.16, -1.32)
u = Vector(A, B)
c = Circle(A, B)
D = Point(c)
a = Line(D, u)
v = Vector(A, D)
b = Line(B, v)
C = Intersect(a, b)
w = Vector(D, C)
z = Vector(B, C)