A = (0.26, 2.66)
B = (0.26, 5.44)
c = Circle(A, B)
C = Point(c)
a = Line(A, C)
D = Intersect(c, a, 2)
α = Angle(D, A, C)
d = CircumcircleArc(D, A, C)
b = Segment(D, B)
e = Segment(C, B)
β = Angle(D, B, C)
f = CircleSector(A, D, C)