t = 0 (slider from 0 to 12.566370614359172, step 0.1)
P: (0.1 t cos(2 t), 0.1 t sin(2 t))
O = (0, 0)
r = Segment(O, P)
a = CurveCartesian(0.1 p cos(2 p), 0.1 p sin(2 p), p, 0, 12.566370614359172)