A: (1, 1, 0)
B: (1, -2, 0)
C: (-2, 0, 0)
D: (0, 0, 4)
O: C + (0.5 * Vector[C, D])
N: B + (1 / 3 * Vector[B, D])
S: C + (4 / 5 * Vector[C, B])
u = Vector(A, B)
v = Vector(A, C)
w = Vector(A, D)
a, faceABC, faceACD, faceBCD, faceABD, arêteAC, arêteBC, arêteAB, arêteAD, arêteCD, arêteBD = Pyramid(A, C, B, D)
TEST: A + (-2 * u) + (2 * v) + (1 * w)
g = Line(N, O)