r = 3.5 (slider from 0 to 5)
h = 1 (slider from 0 to 5)
k = 4 (slider from 0 to 10)
a = CurveCartesian((r * cos(((2 * π) * t))), (r * sin(((2 * π) * t))), (h * t), t, 0, k)