A: (2, 3, 1)
B: (4, 1, 2)
C: (6, 3, 7)
D: (-5, -4, 8)
a, faceABC, faceABD, faceBCD, faceACD, arêteAB, arêteBC, arêteAC, arêteAD, arêteBD, arêteCD = Pyramid(A, B, C, D)
u = Vector(A, B)
v = Vector(A, C)
w = Vector(A, D)
n_1: u ⊗ v
n_2: u ⊗ w
d: (n_1 * n_2)
α = Angle(C, A, B)
θ = Angle(n_1, n_2)
E = (5.255917366628326, 1.7742790715973236, 0)
F = (5.779159072843562, 3.428358422840807, 0)