P: (0, 0, 0)
Q: (0, 0, 2)
f = Line(Q, P)
a = 2.9 (slider from 0 to 5, step 0.1)
b = 3 (slider from 0 to 5, step 0.1)
c = 0.6 (slider from 0 to 5, step 0.1)
A: (4, 0, a)
B: (0, 4, b)
C: (0, 0, c)
p = Plane(A, B, C)
d, e, g = Cone(P, Q, 3)
h = IntersectPath(p, d)
E, F, G, H = Corner(h)