M = (7.48, -0.48)
B = (4.24, 2.26)
c = Circle(M, B)
C = Point(c)
D = Point(c)
A = Point(c)
a = Segment(B, C)
b = Segment(C, D)
d = Segment(D, A)
e = Segment(A, B)
α = Angle(D, A, B)
β = Angle(A, B, C)
γ = Angle(B, C, D)
δ = Angle(C, D, A)