C = centro da rotação

A = (2.1974526899047553, 4.8033456083141965)
θ = 100 (slider from -500 to 500, step 0.1)
B = (0.27449601760583614, 3.7350363459259097)
c = Circle(B, A)
A' = Rotate(A, θ°, B)
α = Angle(A, B, A')
u = Vector(B, A)
v = Vector(B, A')
d = Circle(B, 1)
C = Point(u)
D = Point(v)
e = CircleArc(B, C, D)
texto1: "" + θ + ""
f = CircleArc(B, D, C)