Ví dụ 2: point animated on circle

a = 3.3 (slider from 0 to 10, step 0.1)
A = (-0.06, 2.56)
B = (-2.84, 2.98)
c = Circle(A, B)
C = (5.0600000000000005, 2.52)
b = Ray(A, C)
C' = Rotate(C, a * 360.0 * ° / 10.0, A)
α = Angle(C, A, C')
d = Ray(A, C')
D = Intersect(c, d)