O = (-0.8760720191216699, 1.887496679353654)
M = (8.243131432954746, 1.9845094820353184)
c = Segment(O, M)
α = 0.6981317007977318 rad (slider from 0 to 6.283185307179586, step 0.017453292519943295)
M' = Rotate(M, α, O)
a = Segment(O, M')
β = Angle(M, O, M')
d = CircleArc(O, M, M')