A = (0.8006562294270736, 1.697768650605774, 2.0567221447944375)
B = (1.1928147961743756, -2.8427597455984017, 0.6164507776169554)
C = (2.9397834760977863, -2.79760784094507, 1.6326865727246147)
u = Vector(B, C)
c = Circle(A, 3, u)
D = Point(c)
v = Vector(A, D)
a = PerpendicularPlane(A, v)
E, F = Intersect(a, c)
w = Vector(A, E)
α = 4.50294947014537 rad (slider from 0 to 6.283185307179586, step 0.017453292519943295)
D': A + cos(α) * v + sin(α) * w