A = (-4, -5, -2)
B = (0, -5, -2)
C = (4, 4, 2)
E = Point(zAxis)
a, FlächeABC, FlächeABE, FlächeBCE, FlächeACE, KanteAB, KanteBC, KanteAC, KanteAE, KanteBE, KanteCE = Pyramid(A, B, C, E)
D = Intersect(KanteBE, xOyPlane)
b = Plane(E, A, C)