A = (4.4799999999999995, 0.6999999999999997)
c = Circle(A, 5)
B = Point(c)
a = 3 (slider from 0 to 100, step 0.1)
C = Rotate(B, 360 ° / a, A)
α = Angle(B, A, C)
poly1, b, d, e, D = Polygon(B, C, a)