AB = B - A = [4, -4, -2]
AD = C - A = [-2, -4, 4]
Normalenvektor
k·n = AB x AD = - 12·[2, 1, 2]
Länge des Normalenvektors
|n| = |[2, 1, 2]| = 3
Mittelpunkt der Grundfläche
M = 1/2·(A + C) = [4, 1, 0]
Spitzen der Pyramiden
S1 = M + 2·n = [8, 3, 4]
S2 = M - 2·n = [0, -1, -4]