r = 1.7 (slider from 0.2 to 5, step 0.1)
O_1 = (-2.828712847414411, 4.178727207330659)
O = (-2.3994368304859592, 4.1171181493455515)
c = Circle(O, r)
A = (-4.684934142836517, 6.184002675297359)
b, d = Tangent(A, c)
C = Intersect(c, d, 1)
e = Ray(A, C)
E = Point(e)
f = Segment(A, E)
a, g = Tangent(A, c)
B = Intersect(c, a, 1)
h = Ray(A, B)
D = Point(h)
i = Segment(A, D)
j = Segment(B, C)
β = Angle(C, B, A)
α = Angle(D, A, C)
γ = Angle(B, C, E)
k = CircleArc(O, C, B)
p = CircleArc(O, B, C)