O = (3, 3)
A = (5, 4)
c = Circle(O, A)
B = Rotate(A, 50°, O)
α = Angle(A, O, B)
H = Midpoint(B, A)
a = Segment(O, B)
b = Segment(B, H)
d = Segment(H, A)
e = Segment(O, A)
f = Segment(O, H)
β = Angle(O, H, A)
γ = Angle(A, O, H)
δ = Angle(H, O, B)