A = (0.2, -1)
B = (4.1, -1)
a = Segment(A, B)
c = Circle(A, B)
C = Point(c)
d = Circle(B, A)
e = Circle(C, A)
D = Intersect(d, e, 2.0)
b = Segment(A, C)
f = Segment(B, D)
g = Segment(C, D)