B = (-0.92, 2.58)
a_1 = 4
C = Point(Circle[B, 4])
a = Segment(B, C)
f = OrthogonalLine(C, a)
e = Circle(B, 7)
A = Intersect(e, f, 2)
c = Segment(B, A)
b = Segment(C, A)
α = Angle(A, C, B)
β = Angle(B, A, C)
γ = Angle(C, B, A)